diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 411a0fa9..6c1df55b 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -86,6 +86,8 @@
     <Compile Include="Astronauts\ArcGXP.cs" />
     <Compile Include="Banana\ImageGEC.cs" />
     <Compile Include="BlackRainbow\ArcPAK.cs" />
+    <Compile Include="CaramelBox\ArcARC4.cs" />
+    <Compile Include="CaramelBox\ImageFCB.cs" />
     <Compile Include="Cmvs\ArcPBZ.cs" />
     <Compile Include="Cmvs\AudioMV.cs" />
     <Compile Include="Cmvs\ImagePSB.cs" />
diff --git a/ArcFormats/CaramelBox/ArcARC4.cs b/ArcFormats/CaramelBox/ArcARC4.cs
new file mode 100644
index 00000000..37f3c4c9
--- /dev/null
+++ b/ArcFormats/CaramelBox/ArcARC4.cs
@@ -0,0 +1,368 @@
+//! \file       ArcARC4.cs
+//! \date       Wed Aug 10 15:50:21 2016
+//! \brief      Caramel BOX resource archive.
+//
+// Copyright (C) 2016 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using GameRes.Utility;
+
+namespace GameRes.Formats.CaramelBox
+{
+    internal class Arc4Entry : PackedEntry
+    {
+        public List<long>   Segments;
+    }
+
+    [Export(typeof(ArchiveFormat))]
+    public class Arc4Opener : ArchiveFormat
+    {
+        public override string         Tag { get { return "ARC4"; } }
+        public override string Description { get { return "Caramel BOX resource archive"; } }
+        public override uint     Signature { get { return 0x34435241; } } // 'ARC4'
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool     CanCreate { get { return false; } }
+
+        public Arc4Opener ()
+        {
+            Extensions = new string[] { "bin", "dat", "データ" };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (0x010000 != file.View.ReadUInt32 (4))
+                return null;
+            int count = file.View.ReadInt32 (0x10);
+            if (!IsSaneCount (count))
+                return null;
+            uint index_length = file.View.ReadUInt32 (8);
+            uint alignment    = file.View.ReadUInt32 (0xC);
+            int index_offset  = file.View.ReadInt32 (0x14);
+            int names_offset  = file.View.ReadInt32 (0x1C) - index_offset;
+            int segment_table = file.View.ReadInt32 (0x24) - index_offset;
+            uint base_offset  = file.View.ReadUInt32 (0x2C);
+            if (0 == alignment || index_offset <= 0 || names_offset <= 0 || segment_table <= 0)
+                return null;
+            if (!file.View.AsciiEqual (index_offset, "tZ"))
+                return null;
+            byte[] index;
+            using (var packed = file.CreateStream (index_offset, index_length))
+            using (var tz = new TzCompression (packed))
+                index = tz.Unpack();
+
+            int current_offset = 0;
+            var dir = new List<Entry> (count);
+            for (int i = 0; i < count; ++i)
+            {
+                int name_pos = ReadInt24 (index, current_offset) * 2;
+                int name_length = index[current_offset+3];
+                int chunk_count = index[current_offset+4];
+                int offset = ReadInt24 (index, current_offset+5);
+                var name = Binary.GetCString (index, names_offset + name_pos, name_length);
+                var entry = FormatCatalog.Instance.Create<Arc4Entry> (name);
+                entry.Segments = new List<long> (chunk_count);
+                if (chunk_count > 1)
+                {
+                    int segment_pos = segment_table + 3 * offset;
+                    for (int j = 0; j < chunk_count; ++j)
+                    {
+                        entry.Segments.Add (ReadInt24 (index, segment_pos) + base_offset);
+                        segment_pos += 3;
+                    }
+                }
+                else
+                    entry.Segments.Add (offset + base_offset);
+
+                for (int j = 0; j < chunk_count; ++j)
+                    entry.Segments[j] *= alignment;
+                dir.Add (entry);
+                current_offset += 8;
+            }
+            foreach (Arc4Entry entry in dir)
+            {
+                uint size = 0;
+                foreach (var segment in entry.Segments)
+                {
+                    size += Binary.BigEndian (file.View.ReadUInt32 (segment+4));
+                }
+                entry.Offset = entry.Segments[0] + 0x10;
+                entry.Size = size;
+                entry.IsPacked = file.View.AsciiEqual (entry.Offset, "tZ");
+                if (entry.IsPacked)
+                    entry.UnpackedSize = file.View.ReadUInt32 (entry.Offset+2);
+                else
+                    entry.UnpackedSize = size;
+            }
+            return new ArcFile (file, this, dir);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var xent = (Arc4Entry)entry;
+            Stream input;
+            if (1 == xent.Segments.Count)
+                input = arc.File.CreateStream (entry.Offset, entry.Size);
+            else
+                input = new Arc4Stream (arc.File, xent);
+            if (!xent.IsPacked)
+                return input;
+            using (input)
+            using (var tz = new TzCompression (input))
+                return new MemoryStream (tz.Unpack());
+        }
+
+        static int ReadInt24 (byte[] data, int pos)
+        {
+            return data[pos] << 16 | data[pos+1] << 8 | data[pos+2];
+        }
+    }
+
+    internal sealed class TzCompression : IDisposable
+    {
+        BinaryReader        m_input;
+
+        public TzCompression (Stream stream)
+        {
+            m_input = new ArcView.Reader (stream);
+        }
+
+        public byte[] Unpack ()
+        {
+            int signature = m_input.ReadUInt16();
+            uint unpacked_size = m_input.ReadUInt32();
+            var data = new byte[unpacked_size];
+            int dst = 0;
+            var buffer = new byte[0x10000];
+            while (dst < data.Length)
+            {
+                signature = m_input.ReadUInt16();
+                ushort block_size = m_input.ReadUInt16();
+                ushort unpacked_block_size = m_input.ReadUInt16();
+                if (0 == unpacked_block_size)
+                    throw new InvalidFormatException();
+
+                ushort key = m_input.ReadUInt16();
+                if (block_size != m_input.Read (buffer, 0, block_size))
+                    throw new EndOfStreamException();
+                DecryptBlock (buffer, 0, block_size, key);
+                if (0x7453 == signature) // 'St'
+                    Buffer.BlockCopy (buffer, 0, data, dst, unpacked_block_size);
+                else if (0x745A == signature) // 'Zt'
+                    UnpackBlock (buffer, 0, block_size, data, dst, unpacked_block_size);
+                else
+                    throw new InvalidFormatException();
+                dst += unpacked_block_size;
+            }
+            return data;
+        }
+
+        unsafe void DecryptBlock (byte[] data, int pos, int count, uint key)
+        {
+            fixed (byte* data8 = &data[pos])
+            {
+                ushort* data16 = (ushort*)data8;
+                for (int i = count / 2; i > 0; --i)
+                {
+                    key *= 0x1465D9;
+                    key += 0x0FB5;
+                    *data16++ -= (ushort)(key >> 16);
+                }
+            }
+        }
+
+        void UnpackBlock (byte[] input, int src, int input_size,
+                          byte[] output, int dst, int output_size)
+        {
+            int src_end = src + input_size;
+            while (src < src_end)
+            {
+                int ctl = input[src++];
+                if (0 == ctl)
+                    break;
+                if (0 != (ctl & 0x80))
+                {
+                    int offset, count;
+                    if (0 != (ctl & 0x40))
+                    {
+                        if (0 != (ctl & 0x20))
+                        {
+                            ctl = (ctl << 8) | input[src++];
+                            ctl = (ctl << 8) | input[src++];
+
+                            count = (ctl & 0x3F) + 4;
+                            offset = (ctl >> 6) & 0x7FFF;
+                        }
+                        else
+                        {
+                            ctl = (ctl << 8) | input[src++];
+
+                            count = (ctl & 7) + 3;
+                            offset = (ctl >> 3) & 0x3FF;
+                        }
+                    }
+                    else
+                    {
+                        count = (ctl & 3) + 2;
+                        offset = (ctl >> 2) & 0xF;
+                    }
+                    ++offset;
+                    Binary.CopyOverlapped (output, dst - offset, dst, count);
+                    dst += count;
+                }
+                else
+                {
+                    Buffer.BlockCopy (input, src, output, dst, ctl);
+                    src += ctl;
+                    dst += ctl;
+                }
+            }
+        }
+
+        #region IDisposable Members
+        bool _disposed = false;
+        public void Dispose ()
+        {
+            if (!_disposed)
+            {
+                m_input.Dispose();
+                _disposed = true;
+            }
+        }
+        #endregion
+    }
+
+    internal class Arc4Stream : Stream
+    {
+        ArcView     m_file;
+        IEnumerator<long> m_segment;
+        Stream      m_stream;
+        bool        m_eof = false;
+
+        public override bool CanRead  { get { return !_disposed; } }
+        public override bool CanSeek  { get { return false; } }
+        public override bool CanWrite { get { return false; } }
+        public override long Length   { get { throw new NotSupportedException ("Arc4Stream.Length not supported"); } }
+        public override long Position
+        {
+            get { throw new NotSupportedException ("Arc4Stream.Position not supported."); }
+            set { throw new NotSupportedException ("Arc4Stream.Position not supported."); }
+        }
+
+        public Arc4Stream (ArcView file, Arc4Entry entry)
+        {
+            m_file = file;
+            m_segment = entry.Segments.GetEnumerator();
+            NextSegment();
+        }
+
+        private void NextSegment ()
+        {
+            if (!m_segment.MoveNext())
+            {
+                m_eof = true;
+                return;
+            }
+            var prev_stream = m_stream;
+            long offset = m_segment.Current;
+            var segment_size = Binary.BigEndian (m_file.View.ReadUInt32 (offset+4));
+            m_stream = m_file.CreateStream (offset+0x10, segment_size);
+            if (null != prev_stream)
+                prev_stream.Dispose();
+        }
+
+        public override int Read (byte[] buffer, int offset, int count)
+        {
+            int total = 0;
+            while (!m_eof && count > 0)
+            {
+                int read = m_stream.Read (buffer, offset, count);
+                if (0 != read)
+                {
+                    total += read;
+                    offset += read;
+                    count -= read;
+                }
+                if (0 != count)
+                    NextSegment();
+            }
+            return total;
+        }
+
+        public override int ReadByte ()
+        {
+            int b = -1;
+            while (!m_eof)
+            {
+                b = m_stream.ReadByte();
+                if (-1 != b)
+                    break;
+                NextSegment();
+            }
+            return b;
+        }
+
+        public override void Flush ()
+        {
+        }
+
+        public override long Seek (long offset, SeekOrigin origin)
+        {
+            throw new NotSupportedException ("Arc4Stream.Seek method is not supported");
+        }
+
+        public override void SetLength (long length)
+        {
+            throw new NotSupportedException ("Arc4Stream.SetLength method is not supported");
+        }
+
+        public override void Write (byte[] buffer, int offset, int count)
+        {
+            throw new NotSupportedException ("Arc4Stream.Write method is not supported");
+        }
+
+        public override void WriteByte (byte value)
+        {
+            throw new NotSupportedException("Arc4Stream.WriteByte method is not supported");
+        }
+
+        #region IDisposable Members
+        bool _disposed = false;
+        protected override void Dispose (bool disposing)
+        {
+            if (!_disposed)
+            {
+                if (disposing)
+                {
+                    if (null != m_stream)
+                        m_stream.Dispose();
+                    m_segment.Dispose();
+                }
+                _disposed = true;
+                base.Dispose (disposing);
+            }
+        }
+        #endregion
+    }
+}
diff --git a/ArcFormats/CaramelBox/ImageFCB.cs b/ArcFormats/CaramelBox/ImageFCB.cs
new file mode 100644
index 00000000..7d6daebc
--- /dev/null
+++ b/ArcFormats/CaramelBox/ImageFCB.cs
@@ -0,0 +1,208 @@
+//! \file       ImageFCB.cs
+//! \date       Thu Aug 11 04:21:02 2016
+//! \brief      Caramel BOX compressed image format.
+//
+// Copyright (C) 2016 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Windows.Media;
+using GameRes.Compression;
+using GameRes.Utility;
+
+namespace GameRes.Formats.CaramelBox
+{
+    internal class FcbMetaData : ImageMetaData
+    {
+        public int Method;
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class FcbFormat : ImageFormat
+    {
+        public override string         Tag { get { return "FCB"; } }
+        public override string Description { get { return "Caramel BOX image format"; } }
+        public override uint     Signature { get { return 0x31626366; } } // 'fcb1'
+
+        public override ImageMetaData ReadMetaData (Stream stream)
+        {
+            var header = new byte[0x10];
+            if (header.Length != stream.Read (header, 0, header.Length))
+                return null;
+            return new FcbMetaData
+            {
+                Width  = LittleEndian.ToUInt32 (header, 4),
+                Height = LittleEndian.ToUInt32 (header, 8),
+                Method = LittleEndian.ToInt32 (header, 12),
+                BPP    = 32,
+            };
+        }
+
+        public override ImageData Read (Stream stream, ImageMetaData info)
+        {
+            var meta = (FcbMetaData)info;
+            byte[] input;
+            if (1 == meta.Method)
+            {
+                stream.Position = 0x14;
+                using (var reader = new ArcView.Reader (stream))
+                {
+                    int unpacked_size = Binary.BigEndian (reader.ReadInt32());
+                    reader.ReadInt32(); // packed_size
+                    input = new byte[unpacked_size];
+                    using (var z = new ZLibStream (stream, CompressionMode.Decompress, true))
+                        if (unpacked_size != z.Read (input, 0, unpacked_size))
+                            throw new EndOfStreamException();
+                }
+            }
+            else if (0 == meta.Method)
+            {
+                stream.Position = 0x10;
+                using (var tz = new TzCompression (stream))
+                    input = tz.Unpack();
+            }
+            else
+                throw new InvalidFormatException();
+            var pixels = Unpack (input, info);
+            return ImageData.Create (info, PixelFormats.Bgra32, null, pixels);
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("FcbFormat.Write not implemented");
+        }
+
+        byte[] Unpack (byte[] input, ImageMetaData info)
+        {
+            byte[] ref_pixel = { 0x80, 0x80, 0x80, 0xFF };
+            var pixel = new byte[4];
+            var delta = new int[4];
+
+            var output = new byte[info.Width * info.Height * 4];
+            int src = 0;
+            int dst = 0;
+            for (uint y = 0; y < info.Height; ++y)
+            {
+                pixel[0] = ref_pixel[0];
+                pixel[1] = ref_pixel[1];
+                pixel[2] = ref_pixel[2];
+                pixel[3] = ref_pixel[3];
+
+                for (uint x = 0; x < info.Width; ++x)
+                {
+                    int v = input[src++];
+                    if (0 != (v & 0x80))
+                    {
+                        if (0 != (v & 0x40))
+                        {
+                            if (0 != (v & 0x20))
+                            {
+                                if (0 != (v & 0x10))
+                                {
+                                    if (0 != (v & 0x08))
+                                    {
+                                        if (v == 0xFE)
+                                        {
+                                            delta[0] = input[src++] - 128;
+                                            delta[1] = input[src++] - 128;
+                                            delta[2] = input[src++] - 128;
+                                            delta[3] = 0;
+                                        }
+                                        else
+                                        {
+                                            delta[0] = input[src++] - 128;
+                                            delta[1] = input[src++] - 128;
+                                            delta[2] = input[src++] - 128;
+                                            delta[3] = input[src++] - 128;
+                                        }
+                                    }
+                                    else
+                                    {
+                                        v = input[src++] | v << 8;
+                                        v = input[src++] | v << 8;
+                                        v = input[src++] | v << 8;
+                                        delta[0] = ((v >> 20) & 0x7F) - 64;
+                                        delta[1] = ((v >> 14) & 0x3F) - 32;
+                                        delta[2] = ((v >> 8)  & 0x3F) - 32;
+                                        delta[3] = v - 128;
+                                    }
+                                }
+                                else
+                                {
+                                    v = input[src++] | v << 8;
+                                    v = input[src++] | v << 8;
+                                    delta[0] = ((v >> 14) & 0x3F) - 32;
+                                    delta[1] = ((v >> 10) & 0x0F) - 8;
+                                    delta[2] = ((v >> 6)  & 0x0F) - 8;
+                                    delta[3] = (v & 0x3F) - 32;
+                                }
+                            }
+                            else
+                            {
+                                v = input[src++] | v << 8;
+                                v = input[src++] | v << 8;
+                                delta[0] = ((v >> 13) & 0xFF) - 128;
+                                delta[1] = ((v >> 7)  & 0x3F) - 32;
+                                delta[2] = (v & 0x7F) - 64;
+                                delta[3] = 0;
+                            }
+                        }
+                        else
+                        {
+                            v = input[src++] | v << 8;
+                            delta[0] = ((v >> 8) & 0x3F) - 32;
+                            delta[1] = ((v >> 4) & 0x0F) - 8;
+                            delta[2] = (v & 0xf) - 8;
+                            delta[3] = 0;
+                        }
+                    }
+                    else
+                    {
+                        delta[0] = ((v >> 4) & 7) - 4;
+                        delta[1] = ((v >> 2) & 3) - 2;
+                        delta[2] = (v & 3) - 2;
+                        delta[3] = 0;
+                    }
+
+                    pixel[0] += (byte)(delta[0] + delta[1]);
+                    pixel[1] += (byte)delta[0];
+                    pixel[2] += (byte)(delta[0] + delta[2]);
+                    pixel[3] += (byte)delta[3];
+
+                    output[dst++] = pixel[0];
+                    output[dst++] = pixel[1];
+                    output[dst++] = pixel[2];
+                    output[dst++] = pixel[3];
+
+                    if (0 == x)
+                    {
+                        ref_pixel[0] = pixel[0];
+                        ref_pixel[1] = pixel[1];
+                        ref_pixel[2] = pixel[2];
+                        ref_pixel[3] = pixel[3];
+                    }
+                }
+            }
+            return output;
+        }
+    }
+}
diff --git a/supported.html b/supported.html
index 6fc8ce97..13f9ae53 100644
--- a/supported.html
+++ b/supported.html
@@ -517,6 +517,7 @@ X Change 2R<br/>
 Eve to Iu Na no Omocha<br/>
 Hirusagari no Danchi In Tsuma<br/>
 Hissatsu Chikannin II<br/>
+Kahanshin no Kabe ~ Shin Ryoujoku Chikan Jigoku<br/>
 Otomegari<br/>
 Ryoujoku Gojuusou<br/>
 Shinjin Kangofu Miho<br/>
@@ -987,11 +988,13 @@ Kara no Shoujo 2<br/>
 Aniyome Kyouka-san to Sono Haha Chikako-san<br/>
 Aru Kazoku no Kankeizu<br/>
 Cosplay Ecchi ~Layer Kana no Yuuutsu~<br/>
+Gakkou Yarashii Kaidan<br/>
 Hanamaru! 2<br/>
 Hime Kami 1/2<br/>
 In'youchuu Goku ~Ryoujoku Jigoku Taimaroku~<br/>
 In'youchuu Rei ~Ryoujoku Shiro Taima Emaki~<br/>
 Kuraibito<br/>
+Naze ka Kanojo ga Boku ni Ecchi o Sematte Kuru Ken<br/>
 Onna Kyoushi Suzune<br/>
 Oshioki ~Gakuen Reijou Kousei Keikaku~<br/>
 Ore Maou! ~Kudake Chitta Tamashii<br/>
@@ -1030,6 +1033,10 @@ Uchuu Keiji Soldivan<br/>
 <tr class="odd"><td>*.ttd</td><td><tt>.FRC</tt></td><td>No</td><td>Morning</td><td>
 Binkan Ecchi! ~Futari no Oyatsu wa Tokunou Milk~<br/>
 </td></tr>
+<tr><td>*.bin</td><td><tt>ARC4</tt></td><td>No</td><td rowspan="2">Caramel BOX</td><td rowspan="2">
+Boku no Te no Naka no Rakuen<br/>
+</td></tr>
+<tr><td>*.fcb</td><td><tt>fcb1</tt></td><td>No</td></tr>
 </table>
 <p><a name="note-1" class="footnote">1</a> Non-encrypted only</p>
 </body>