diff --git a/src/lang/japanese.txt b/src/lang/japanese.txt
--- a/src/lang/japanese.txt
+++ b/src/lang/japanese.txt
@@ -639,9 +639,6 @@ STR_MUSIC_PLAYLIST_CUSTOM_1                                     :{TINY_FONT}{BLACK}カスタム1
 STR_MUSIC_PLAYLIST_CUSTOM_2                                     :{TINY_FONT}{BLACK}カスタム2
 STR_MUSIC_MUSIC_VOLUME                                          :{TINY_FONT}{BLACK}音楽音量
 STR_MUSIC_EFFECTS_VOLUME                                        :{TINY_FONT}{BLACK}効果音音量
-STR_MUSIC_RULER_MIN                                             :{TINY_FONT}{BLACK}最小
-STR_MUSIC_RULER_MAX                                             :{TINY_FONT}{BLACK}最大
-STR_MUSIC_RULER_MARKER                                          :{TINY_FONT}{BLACK}'
 STR_MUSIC_TRACK_NONE                                            :{TINY_FONT}{DKGREEN}--
 STR_MUSIC_TRACK_DIGIT                                           :{TINY_FONT}{DKGREEN}{ZEROFILL_NUM}
 STR_MUSIC_TITLE_NONE                                            :{TINY_FONT}{DKGREEN}------