diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index f6082553..307be2a7 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -144,6 +144,7 @@
       <DependentUpon>WidgetMGPK.xaml</DependentUpon>
     </Compile>
     <Compile Include="Marble\VideoANIM.cs" />
+    <Compile Include="MD5.cs" />
     <Compile Include="Nekopunch\ArcPAK.cs" />
     <Compile Include="NitroPlus\ArcPAK.cs" />
     <Compile Include="MnoViolet\ImageDIF.cs" />
@@ -157,6 +158,7 @@
     <Compile Include="NonColor\WidgetNCARC.xaml.cs">
       <DependentUpon>WidgetNCARC.xaml</DependentUpon>
     </Compile>
+    <Compile Include="NScripter\ArcNS2.cs" />
     <Compile Include="Patisserie\ArcBIN.cs" />
     <Compile Include="Patisserie\ArcRAW.cs" />
     <Compile Include="RealLive\ArcG00.cs" />
diff --git a/ArcFormats/NScripter/ArcNS2.cs b/ArcFormats/NScripter/ArcNS2.cs
new file mode 100644
index 00000000..47c5dccf
--- /dev/null
+++ b/ArcFormats/NScripter/ArcNS2.cs
@@ -0,0 +1,227 @@
+//! \file       ArcNS2.cs
+//! \date       Sat Jul 30 13:00:13 2016
+//! \brief      NS2 resorce archives.
+//
+// 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 System.Security.Cryptography;
+using System.Text;
+using GameRes.Formats.Properties;
+using GameRes.Formats.Strings;
+
+namespace GameRes.Formats.NScripter
+{
+    [Export(typeof(ArchiveFormat))]
+    public class Ns2Opener : ArchiveFormat
+    {
+        public override string         Tag { get { return "NS2"; } }
+        public override string Description { get { return arcStrings.NSADescription; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool     CanCreate { get { return false; } }
+
+        public static Dictionary<string, string> KnownKeys = new Dictionary<string, string>();
+
+        public override ResourceScheme Scheme
+        {
+            get { return new NsaScheme { KnownKeys = KnownKeys }; }
+            set { KnownKeys = ((NsaScheme)value).KnownKeys; }
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            List<Entry> dir = null;
+            uint data_offset = file.View.ReadUInt32 (0);
+            if (data_offset > 4 && data_offset < file.MaxOffset)
+            {
+                try
+                {
+                    using (var input = file.CreateStream())
+                    {
+                        dir = ReadIndex (input);
+                        if (null != dir)
+                            return new ArcFile (file, this, dir);
+                    }
+                }
+                catch { /* ignore parse errors */ }
+            }
+            if (!file.Name.EndsWith (".ns2", StringComparison.InvariantCultureIgnoreCase))
+                return null;
+
+            var password = QueryPassword();
+            if (string.IsNullOrEmpty (password))
+                return null;
+            var key = Encoding.ASCII.GetBytes (password);
+            if (key.Length < 96)
+                throw new OperationCanceledException ("Password should be at least 96 characters long");
+
+            using (var input = new Ns2Stream (file, key))
+            {
+                dir = ReadIndex (input);
+                if (null == dir)
+                    return null;
+                return new NsaEncryptedArchive (file, this, dir, key);
+            }
+        }
+
+        protected List<Entry> ReadIndex (Stream file)
+        {
+            using (var input = new BinaryReader (file, Encodings.cp932, true))
+            {
+                uint base_offset = input.ReadUInt32();
+                if (base_offset <= 4 || base_offset >= file.Length)
+                    return null;
+
+                var name_buffer = new char[0x100];
+                long current_offset = base_offset;
+                var dir = new List<Entry>();
+                while (file.Position < base_offset)
+                {
+                    if (input.ReadChar() != '"')
+                        break;
+                    char c;
+                    int i = 0;
+                    while ((c = input.ReadChar()) != '"')
+                    {
+                        if (name_buffer.Length == i)
+                            return null;
+                        name_buffer[i++] = c;
+                    }
+                    if (0 == i)
+                        return null;
+                    var name = new string (name_buffer, 0, i);
+                    var entry = FormatCatalog.Instance.Create<Entry> (name);
+                    entry.Offset = current_offset;
+                    entry.Size   = input.ReadUInt32();
+                    if (!entry.CheckPlacement (file.Length))
+                        return null;
+                    current_offset += entry.Size;
+                    dir.Add (entry);
+                }
+                return dir.Count > 0 ? dir : null;
+            }
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var nsa_arc = arc as NsaEncryptedArchive;
+            if (null == nsa_arc)
+            {
+                return arc.File.CreateStream (entry.Offset, entry.Size);
+            }
+            var encrypted = new Ns2Stream (arc.File, nsa_arc.Key);
+            return new StreamRegion (encrypted, entry.Offset, entry.Size);
+        }
+
+        private string QueryPassword ()
+        {
+            var options = Query<NsaOptions> (arcStrings.ArcEncryptedNotice);
+            return options.Password;
+        }
+
+        public override ResourceOptions GetDefaultOptions ()
+        {
+            return new NsaOptions { Password = Settings.Default.NSAPassword };
+        }
+
+        public override ResourceOptions GetOptions (object widget)
+        {
+            var w = widget as GUI.WidgetNSA;
+            if (null != w)
+                Settings.Default.NSAPassword = w.Password.Text;
+            return GetDefaultOptions();
+        }
+
+        public override object GetAccessWidget ()
+        {
+            return new GUI.WidgetNSA (KnownKeys);
+        }
+    }
+
+    internal class Ns2Stream : ViewStreamBase
+    {
+        byte[]          m_key;
+
+        static readonly Cryptography.MD5 MD5 = new Cryptography.MD5();
+
+        const int BlockSize   = 32;
+
+        public Ns2Stream (ArcView mmap, byte[] key) : base (mmap)
+        {
+            m_key = key;
+        }
+
+        byte[] m_seed = new byte[64];
+
+        protected override void DecryptBlock ()
+        {
+            int block_count = m_current_block_length / BlockSize;
+            var temp = new byte[32];
+            var hash = new byte[16];
+            for (int src = 0; src < m_current_block_length; src += BlockSize)
+            {
+                int src2 = src + 16;
+                int key1 = 0; // within m_key
+                int key2 = 48;
+
+                Buffer.BlockCopy (m_current_block, src2, m_seed, 0,  16);
+                Buffer.BlockCopy (m_key,           key1, m_seed, 16, 48);
+
+                MD5.Initialize();
+                MD5.Update (m_seed, 0, m_seed.Length);
+                Buffer.BlockCopy (MD5.State, 0, hash, 0, 16);
+
+                for (int j = 0; j < 16; ++j)
+                {
+                    temp[j] = m_seed[j] = (byte)(hash[j] ^ m_current_block[src + j]);
+                }
+
+                Buffer.BlockCopy (m_key, key2, m_seed, 16, 48);
+
+                MD5.Initialize();
+                MD5.Update (m_seed, 0, m_seed.Length);
+                Buffer.BlockCopy (MD5.State, 0, hash, 0, 16);
+                
+                for (int j = 0; j < 16; ++j)
+                {
+                    temp[16 + j] = m_seed[j] = (byte)(hash[j] ^ m_current_block[src2 + j]);
+                }
+
+                Buffer.BlockCopy (m_key, key1, m_seed, 16, 48);
+
+                MD5.Initialize();
+                MD5.Update (m_seed, 0, m_seed.Length);
+                Buffer.BlockCopy (MD5.State, 0, hash, 0, 16);
+
+                Buffer.BlockCopy (temp, 16, m_current_block, src, 16);
+                for (int j = 0; j < 16; ++j)
+                {
+                    m_current_block[src + 16 + j] = (byte)(hash[j] ^ temp[j]);
+                }
+            }
+        }
+    }
+}
diff --git a/supported.html b/supported.html
index 2356eaac..3d2913cb 100644
--- a/supported.html
+++ b/supported.html
@@ -119,6 +119,7 @@ Arpeggio ~Kimi Iro no Melody~<br/>
 Chikan Kizoku<br/>
 Futagoza no Paradox<br/>
 Happy Princess<br/>
+Idol ☆ Revolution<br/>
 Narimono<br/>
 Reconquista<br/>
 White ~blanche comme la lune~<br/>
@@ -163,6 +164,7 @@ Ren'ai Jugyou ~Oshiego no Yuuwaku~<br/>
 </td></tr>
 <tr class="odd"><td>*.nsa<br/>*.sar</td><td>-</td><td>Yes<a href="#note-1" class="footnote">1</a></td><td>NScripter</td><td>
 Binary Pot<br/>
+Chou Gedou Yuusha<br/>
 Tsukihime<br/>
 Umineko<br/>
 </td></tr>
@@ -305,15 +307,17 @@ Nanase Ren<br/>
 Imouto ~Mitsutsubo Complete Edition~<br/>
 </td></tr>
 <tr><td>*</td><td><tt>gra</tt><br/><tt>mas</tt><br/><tt>dif</tt></td><td>No</td></tr>
-<tr class="odd"><td>*.ald</td><td>-</td><td>No</td><td rowspan="4">Alice Soft</td><td rowspan="4">
+<tr class="odd"><td>*.ald</td><td>-</td><td>No</td><td rowspan="5">Alice Soft</td><td rowspan="5">
 Daiteikoku<br/>
 Pastel Chime 3 Bind Seeker<br/>
 Shaman's Sanctuary -Miko no Seiiki-<br/>
 Tsuma Shibori<br/>
+Tsumamigui 3<br/>
 </td></tr>
 <tr class="odd"><td>*.afa</td><td><tt>AFAH</tt></td><td>No</td></tr>
 <tr class="odd"><td>*.alk</td><td><tt>ALK0</tt></td><td>No</td></tr>
 <tr class="odd"><td>*.qnt</td><td><tt>QNT</tt></td><td>No</td></tr>
+<tr class="odd"><td>*.dcf</td><td><tt>dcf</tt></td><td>No</td></tr>
 <tr><td>*.pd<br/>*.pb</td><td>-</td><td>No</td><td>Discovery</td><td>Tsuma Tsuma</td></tr>
 <tr class="odd"><td>*.ifl</td><td><tt>IFLS</tt></td><td>No</td><td rowspan="3">Silky's</td><td rowspan="3">
 Flutter of Birds<br/>
@@ -592,6 +596,7 @@ Thirua Panic<br/>
 <tr><td>*.acd</td><td><tt>ACD 1.00</tt></td><td>No</td></tr>
 <tr class="odd"><td>*.pk<br/>*.gpk<br/>*.tpk<br/>*.wpk<br/></td><td>-</td><td>No</td><td rowspan="2">U-Me Soft</td><td rowspan="2">
 Fetish Omote no Kioku/Ura no Kioku series<br/>
+Kyonyuu Maid Nakadashi Tengoku!<br/>
 </td></tr>
 <tr class="odd"><td>*.grx</td><td><tt>GRX\x1a</tt><br/><tt>SGX\x1a</tt></td><td>No</td></tr>
 <tr><td>*.fpk</td><td><tt>MFWY</tt></td><td>No</td><td rowspan="2">Caligula</td><td rowspan="2">
@@ -987,6 +992,9 @@ Nukiani!! Sweet Home<br/>
 Denpa no Dorei<br/>
 Soushinjutsu Plus<br/>
 </td></tr>
+<tr><td>*.ns2</td><td>-</td><td>No</td><td>NScripter</td><td>
+Rakuin Hime Runed Princess<br/>
+</td></tr>
 </table>
 <p><a name="note-1" class="footnote">1</a> Non-encrypted only</p>
 </body>