diff --git a/src-python/config.py b/src-python/config.py
index 739e7c24..3444a4a3 100644
--- a/src-python/config.py
+++ b/src-python/config.py
@@ -186,7 +186,7 @@ def _overlay_small_validator(val, inst):
             new[key] = float(v)
         elif key in ['display_duration','fadeout_duration'] and isinstance(v,int):
             new[key] = v
-        elif key in ['opacity','ui_scaling', 'ruby_font_scale', 'ruby_line_spacing'] and isinstance(v,(int,float)):
+        elif key in ['opacity','ui_scaling'] and isinstance(v,(int,float)):
             new[key] = float(v)
     return new
 
@@ -202,7 +202,7 @@ def _overlay_large_validator(val, inst):
             new[key] = float(v)
         elif key in ['display_duration','fadeout_duration'] and isinstance(v,int):
             new[key] = v
-        elif key in ['opacity','ui_scaling', 'ruby_font_scale', 'ruby_line_spacing'] and isinstance(v,(int,float)):
+        elif key in ['opacity','ui_scaling'] and isinstance(v,(int,float)):
             new[key] = float(v)
     return new
 
@@ -737,8 +737,6 @@ class Config:
             "opacity": 1.0,
             "ui_scaling": 1.0,
             "tracker": "HMD",
-            "ruby_font_scale": 0.5,
-            "ruby_line_spacing": 4,
         }
         self._OVERLAY_LARGE_LOG = False
         self._OVERLAY_LARGE_LOG_SETTINGS = {
@@ -753,8 +751,6 @@ class Config:
             "opacity": 1.0,
             "ui_scaling": 1.0,
             "tracker": "LeftHand",
-            "ruby_font_scale": 0.5,
-            "ruby_line_spacing": 4,
         }
         self._OVERLAY_SHOW_ONLY_TRANSLATED_MESSAGES = False
         self._SEND_MESSAGE_TO_VRC = True
diff --git a/src-python/model.py b/src-python/model.py
index b7dbded2..975977fc 100644
--- a/src-python/model.py
+++ b/src-python/model.py
@@ -951,10 +951,6 @@ class Model:
         if isinstance(target_language, dict):
             target_language_list = [data["language"] for data in target_language.values() if data.get("enable") is True]
 
-        # Fetch ruby settings from config (with safe defaults if missing)
-        ruby_font_scale = config.OVERLAY_SMALL_LOG_SETTINGS.get("ruby_font_scale", 0.5)
-        ruby_line_spacing = config.OVERLAY_SMALL_LOG_SETTINGS.get("ruby_line_spacing", 4)
-
         # 翻訳行ルビ (任意) が指定されていれば渡す。後方互換のため None / 不正型は空リストに。
         if not isinstance(transliteration_message, list):
             transliteration_message = []
@@ -968,8 +964,6 @@ class Model:
             target_language_list,
             transliteration_message=transliteration_message,
             transliteration_translation=transliteration_translation,
-            ruby_font_scale=ruby_font_scale,
-            ruby_line_spacing=ruby_line_spacing,
         )
 
     def createOverlayImageSmallMessage(self, message):