diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 0970026f..b410cb58 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -204,6 +204,7 @@
     <Compile Include="Kid\ImageKLZ.cs" />
     <Compile Include="Kid\ImageLBG.cs" />
     <Compile Include="Kid\ImageSPC.cs" />
+    <Compile Include="KiriKiri\ArcTLG.cs" />
     <Compile Include="Kogado\ArcARC.cs" />
     <Compile Include="Ice\ImageIBM.cs" />
     <Compile Include="Ice\ScriptISD.cs" />
diff --git a/ArcFormats/KiriKiri/ArcTLG.cs b/ArcFormats/KiriKiri/ArcTLG.cs
new file mode 100644
index 00000000..a4d7f568
--- /dev/null
+++ b/ArcFormats/KiriKiri/ArcTLG.cs
@@ -0,0 +1,109 @@
+//! \file       ArcTLG.cs
+//! \date       Tue Mar 17 2026 10:35:55
+//! \brief      KiriKiri TLG image implementation.
+//---------------------------------------------------------------------------
+// TLGqoi multi-layer image decoder
+//
+// C# port by crsky
+//
+
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+
+namespace GameRes.Formats.KiriKiri
+{
+    internal class TlgLayerEntry : Entry
+    {
+        public int Index;
+    }
+
+    [Export(typeof(ArchiveFormat))]
+    public class TlgOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "TLG"; } }
+        public override string Description { get { return "KiriKiri game engine image format"; } }
+        public override uint     Signature { get { return 0x71474C54; } } // 'TLGq'
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public TlgOpener ()
+        {
+            Extensions = new string[] { "tlg" };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            if (!file.View.AsciiEqual (0, "TLGqoi") || !file.View.AsciiEqual (7, "raw"))
+                return null;
+            var qhdr = Array.Empty<byte> ();
+            var offset = 0x14;
+            while (true)
+            {
+                var entry_signature = file.View.ReadInt32 (offset);
+                var entry_size = file.View.ReadInt32 (offset+4);
+                offset += 8;
+                if (0x52444851 == entry_signature) // 'QHDR'
+                {
+                    if (0x30 != entry_size)
+                        return null;
+                    qhdr = file.View.ReadBytes (offset, (uint)entry_size);
+                    if (entry_size != qhdr.Length)
+                        return null;
+                    offset += entry_size;
+                }
+                else if (0 == entry_signature && 0 == entry_size)
+                    break;
+                else
+                    return null;
+            }
+            if (0 == qhdr.Length)
+                return null;
+            var layer_count = qhdr.ToInt32 (4);
+            if (layer_count < 1)
+                return null;
+            var block_count = qhdr.ToInt32 (12);
+            if (0 == block_count)
+                return null;
+            var dir = new List<Entry> (layer_count);
+            for (var i = 0; i < layer_count; i++)
+            {
+                dir.Add (new TlgLayerEntry
+                {
+                    Name = string.Format ("{0}#{1:D3}.tlg", Path.GetFileNameWithoutExtension (file.Name), i),
+                    Size = (uint)file.MaxOffset,
+                    Type = "image",
+                    Index = i,
+                });
+            }
+            return new ArcFile (file, this, dir);
+        }
+
+        static readonly ResourceInstance<ImageFormat> s_TlgFormat = new ResourceInstance<ImageFormat> ("TLG");
+
+        public override IImageDecoder OpenImage (ArcFile arc, Entry entry)
+        {
+            var layer_entry = entry as TlgLayerEntry;
+            if (null == layer_entry)
+                return base.OpenImage (arc, entry);
+            var input = arc.File.CreateStream ();
+            try
+            {
+                var info = s_TlgFormat.Value.ReadMetaData (input);
+                if (null == info)
+                    throw new InvalidFormatException ();
+                if (info is TlgMetaData tlg)
+                {
+                    tlg.LayerIndex = layer_entry.Index;
+                }
+                return new ImageFormatDecoder (input, s_TlgFormat.Value, info);
+            }
+            catch
+            {
+                input.Dispose ();
+                throw;
+            }
+        }
+    }
+}
diff --git a/ArcFormats/KiriKiri/ImageTLG.cs b/ArcFormats/KiriKiri/ImageTLG.cs
index a715900f..3d533b70 100644
--- a/ArcFormats/KiriKiri/ImageTLG.cs
+++ b/ArcFormats/KiriKiri/ImageTLG.cs
@@ -25,6 +25,7 @@ namespace GameRes.Formats.KiriKiri
     {
         public int Version;
         public long DataOffset;
+        public int LayerIndex;
     }
 
     [Export(typeof(ImageFormat))]
@@ -1520,7 +1521,7 @@ namespace GameRes.Formats.KiriKiri
                     throw new InvalidFormatException ();
             }
             if (0 != qhdr.Length)
-                return DecodeMultiLayerQOI (src, info.Width, info.Height, qhdr, 0);
+                return DecodeMultiLayerQOI (src, info.Width, info.Height, qhdr, info.LayerIndex);
             return DecodeQOI (src, info.Width, info.Height);
         }