diff --git a/OpenUtau.Core/DiffSinger/Phonemizers/DiffSingerJapanesePhonemizer.cs b/OpenUtau.Core/DiffSinger/Phonemizers/DiffSingerJapanesePhonemizer.cs
index 72291c1c9..eadfe377a 100644
--- a/OpenUtau.Core/DiffSinger/Phonemizers/DiffSingerJapanesePhonemizer.cs
+++ b/OpenUtau.Core/DiffSinger/Phonemizers/DiffSingerJapanesePhonemizer.cs
@@ -1,41 +1,31 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using OpenUtau.Api;
-using OpenUtau.Core.G2p;
 
 namespace OpenUtau.Core.DiffSinger {
     [Phonemizer("DiffSinger Japanese Phonemizer", "DIFFS JA", language: "JA")]
-    public class DiffSingerJapanesePhonemizer : DiffSingerG2pPhonemizer {
-        protected override string GetDictionaryName()=>"dsdict-ja.yaml";
-        protected override string GetLangCode()=>"ja";
-        protected override IG2p LoadBaseG2p() => new JapaneseMonophoneG2p();
-        protected override string[] GetBaseG2pVowels() => new string[] {
-            "A", "AP", "E", "I", "N", "O", "SP", "U",
-            "a", "e", "i", "o", "u"
-        };
+    public class DiffSingerJapanesePhonemizer : DiffSingerBasePhonemizer {
+        protected override string GetDictionaryName() => "dsdict-ja.yaml";
 
-        protected override string[] GetBaseG2pConsonants() => new string[] {
-            "b", "by", "ch", "cl", "d", "dy", "f", "g", "gw", "gy", "h", "hy",
-            "j", "k", "kw", "ky", "m", "my", "n", "ng", "ngy", "ny", "p", "py",
-            "r", "ry", "s", "sh", "t", "ts", "ty", "v", "w", "y", "z"
-        };
+        protected override string GetLangCode() => "ja";
 
-        public override Result Process(Note[] notes, Note? prev, Note? next, Note? prevNeighbour, Note? nextNeighbour, Note[] prevs) {
-            if (notes[0].lyric == "-") {
-                return MakeSimpleResult("SP");
+        protected override string[] Romanize(IEnumerable<string> lyrics) {
+            var lyricsArray = lyrics.ToArray();
+            var kanaLyrics = lyricsArray
+                .Where(Kana.Kana.IsKana)
+                .ToList();
+            var kanaResult = Kana.Kana.KanaToRomaji(kanaLyrics.ToList(), Kana.Error.Default, false).ToStrList();
+            if (kanaResult == null) {
+                return lyricsArray;
             }
-            if (!partResult.TryGetValue(notes[0].position, out var phonemes)) {
-                throw new Exception("Part result not found");
+            var kanaIndex = 0;
+            for (int i = 0; i < lyricsArray.Length; i++) {
+                if (Kana.Kana.IsKana(lyricsArray[i])) {
+                    lyricsArray[i] = kanaResult[kanaIndex];
+                    kanaIndex++;
+                }
             }
-            return new Result {
-                phonemes = phonemes
-                    .Select((tu) => new Phoneme() {
-                        phoneme = tu.Item1,
-                        position = tu.Item2,
-                    })
-                    .ToArray(),
-            };
+            return lyricsArray;
         }
     }
 }
diff --git a/OpenUtau.Core/OpenUtau.Core.csproj b/OpenUtau.Core/OpenUtau.Core.csproj
index 1df8a039b..13591fd51 100644
--- a/OpenUtau.Core/OpenUtau.Core.csproj
+++ b/OpenUtau.Core/OpenUtau.Core.csproj
@@ -10,6 +10,7 @@
   <ItemGroup>
     <PackageReference Include="BunLabs.NAudio.Flac" Version="2.0.1" />
     <PackageReference Include="Concentus.OggFile" Version="1.0.4" />
+    <PackageReference Include="csharp-kana" Version="1.0.1" />
     <PackageReference Include="csharp-pinyin" Version="1.0.0" />
     <PackageReference Include="Ignore" Version="0.1.50" />
     <PackageReference Include="K4os.Hash.xxHash" Version="1.0.8" />