diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index ab93e134..832646d5 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -114,6 +114,7 @@
     <Compile Include="Kaguya\ArcUF.cs" />
     <Compile Include="Kurumi\ImageGRA.cs" />
     <Compile Include="Leaf\ArcPX.cs" />
+    <Compile Include="LunaSoft\ArcPAC.cs" />
     <Compile Include="Malie\ArcLIBU.cs" />
     <Compile Include="Malie\LibScheme.cs" />
     <Compile Include="Malie\MalieEncryption.cs" />
diff --git a/ArcFormats/LunaSoft/ArcPAC.cs b/ArcFormats/LunaSoft/ArcPAC.cs
new file mode 100644
index 00000000..bfad8871
--- /dev/null
+++ b/ArcFormats/LunaSoft/ArcPAC.cs
@@ -0,0 +1,67 @@
+//! \file       ArcPAC.cs
+//! \date       2017 Aug 17
+//! \brief      LunaSoft resource archive.
+//
+// Copyright (C) 2017 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;
+
+namespace GameRes.Formats.LunaSoft
+{
+    [Export(typeof(ArchiveFormat))]
+    public class PacOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "PAC/LUNA"; } }
+        public override string Description { get { return "LunaSoft resource archive"; } }
+        public override uint     Signature { get { return 0xAD82CF82; } } // ぱく
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            int count = file.View.ReadInt32 (4);
+            if (!IsSaneCount (count))
+                return null;
+            long base_offset = file.View.ReadUInt32 (8);
+
+            uint current_offset = 0x10;
+            var dir = new List<Entry> (count);
+            for (int i = 0; i < count; ++i)
+            {
+                uint name_length = file.View.ReadUInt32 (current_offset+0x108);
+                var name = file.View.ReadString (current_offset, name_length);
+                var entry = FormatCatalog.Instance.Create<Entry> (name);
+                current_offset += 0x100;
+                entry.Offset = base_offset + file.View.ReadUInt32 (current_offset);
+                entry.Size = file.View.ReadUInt32 (current_offset+4);
+                if (!entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                dir.Add (entry);
+                current_offset += 0xC;
+            }
+            return new ArcFile (file, this, dir);
+        }
+    }
+}