diff --git a/realtime_lora_trainer.py b/realtime_lora_trainer.py
index 14d1587..cd71e96 100644
--- a/realtime_lora_trainer.py
+++ b/realtime_lora_trainer.py
@@ -494,6 +494,10 @@ class RealtimeLoraTrainer:
                 startupinfo = subprocess.STARTUPINFO()
                 startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
 
+            # Set UTF-8 encoding for subprocess to handle non-ASCII output
+            env = os.environ.copy()
+            env['PYTHONIOENCODING'] = 'utf-8'
+
             process = subprocess.Popen(
                 [venv_python, run_script, config_path],
                 stdout=subprocess.PIPE,
@@ -503,7 +507,8 @@ class RealtimeLoraTrainer:
                 errors='replace',
                 bufsize=1,
                 startupinfo=startupinfo,
-                cwd=ai_toolkit_path
+                cwd=ai_toolkit_path,
+                env=env,
             )
 
             # Stream output for progress visibility
diff --git a/sd15_lora_trainer.py b/sd15_lora_trainer.py
index c6cb46c..4f93cbd 100644
--- a/sd15_lora_trainer.py
+++ b/sd15_lora_trainer.py
@@ -460,6 +460,10 @@ class SD15LoraTrainer:
                 startupinfo = subprocess.STARTUPINFO()
                 startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
 
+            # Set UTF-8 encoding for subprocess to handle Japanese text in sd-scripts
+            env = os.environ.copy()
+            env['PYTHONIOENCODING'] = 'utf-8'
+
             process = subprocess.Popen(
                 cmd,
                 stdout=subprocess.PIPE,
@@ -469,6 +473,7 @@ class SD15LoraTrainer:
                 errors='replace',
                 cwd=sd_scripts_path,
                 startupinfo=startupinfo,
+                env=env,
             )
 
             # Stream output
diff --git a/sdxl_lora_trainer.py b/sdxl_lora_trainer.py
index aa4130c..0db9d43 100644
--- a/sdxl_lora_trainer.py
+++ b/sdxl_lora_trainer.py
@@ -461,6 +461,10 @@ class SDXLLoraTrainer:
                 startupinfo = subprocess.STARTUPINFO()
                 startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
 
+            # Set UTF-8 encoding for subprocess to handle Japanese text in sd-scripts
+            env = os.environ.copy()
+            env['PYTHONIOENCODING'] = 'utf-8'
+
             process = subprocess.Popen(
                 cmd,
                 stdout=subprocess.PIPE,
@@ -470,6 +474,7 @@ class SDXLLoraTrainer:
                 errors='replace',
                 cwd=sd_scripts_path,
                 startupinfo=startupinfo,
+                env=env,
             )
 
             # Stream output