"Onii-chan..."
"No, I'm not your onii-chan. Besides, you're a woman, aren't you, a girl? So don't pretend to be my imouto."
"But..."
"No! I don't like ladies, I prefer a little girl. Remember that!"
"But I'm also a little girl."
"Oi, don't lie, you obscure NPC."
According to its use, this NPC, the BOSS Lady Eater who has a special AI system, can interact with players and help the battle. She is operated as a player in general, can be adventurous, and has all the attributes like a player. Although I don't know how the system was created, I judged that having this system would be advantageous for parties who were having a hard time fighting high-level BOSS.
This isn't the first time I've encountered an NPC like this. In the past, I often interacted with "Special" NPCs in various places in this game world. The simple thing to do and become my habit in meeting Special NPCs is to argue with them.