diff --git a/ArcFormats/ShiinaRio/WarcEncryption.cs b/ArcFormats/ShiinaRio/WarcEncryption.cs
index 74555b42..897393c6 100644
--- a/ArcFormats/ShiinaRio/WarcEncryption.cs
+++ b/ArcFormats/ShiinaRio/WarcEncryption.cs
@@ -1156,18 +1156,20 @@ namespace GameRes.Formats.ShiinaRio
     {
         public void Decrypt (byte[] data, int index, uint length, uint flags)
         {
-            if (length >= 0x200 && (flags & 0x204) == 0x204)
+            if ((flags & 0x204) == 0x204)
                 DoCountCrypt (data, index, (int)length);
         }
 
         public void Encrypt (byte[] data, int index, uint length, uint flags)
         {
-            if (length >= 0x200 && (flags & 0x104) == 0x104)
+            if ((flags & 0x104) == 0x104)
                 DoCountCrypt (data, index, (int)length);
         }
 
         void DoCountCrypt (byte[] data, int index, int length)
         {
+            if (length < 0x200)
+                return;
             length = (length & 0x7E) | 1;
             byte count_00 = 0, count_FF = 0;
             for (int i = 0; i < length; ++i)
@@ -1182,6 +1184,39 @@ namespace GameRes.Formats.ShiinaRio
         }
     }
 
+    [Serializable]
+    public class AltCountCrypt : IDecryptExtra
+    {
+        public void Decrypt (byte[] data, int index, uint length, uint flags)
+        {
+            if ((flags & 0x204) == 0x204)
+                DoCountCrypt (data, index, (int)length);
+        }
+
+        public void Encrypt (byte[] data, int index, uint length, uint flags)
+        {
+            if ((flags & 0x104) == 0x104)
+                DoCountCrypt (data, index, (int)length);
+        }
+
+        void DoCountCrypt (byte[] data, int index, int length)
+        {
+            if (length < 0x400)
+                return;
+            length = (length & 0x7E) | 1;
+            byte count_00 = 0, count_FF = 0;
+            for (int i = 0; i < length; ++i)
+            {
+                if (0xFF == data[index+i])
+                    count_FF++;
+                else if (0 == data[index+i])
+                    count_00++;
+            }
+            data[index + 0x100] ^= count_FF;
+            data[index + 0x104] ^= count_00;
+        }
+    }
+
     [Serializable]
     public class UshimitsuCrypt : IDecryptExtra
     {