Changed system prompt with the help of Gemini.

game/script.rpy

@@ -9,8 +9,9 @@ label start:
     show anita happy with dissolve
 
     $ response = fetch_llm('Start the conversation.')[0]
-    $ emotion, line = parse_emotion(response)
-    show expression f'anita {emotion}'
+    $ sanitized = sanitize_speech(response)
+    $ emotion, line = parse_emotion(sanitized)
+    show anita happy
     a "[line]"
 
     while True:
@@ -20,9 +21,10 @@ label start:
 
         while i < len(response):
             $ r = response[i].strip()
+            $ s = sanitize_speech(r)
 
-            if r != '':
-                $ emotion, line = parse_emotion(r)
+            if s != '':
+                $ emotion, line = parse_emotion(s)
                 if emotion is not None:
                     show expression f'anita {emotion}'
                 a "[line]"