It's just an idea now, and I'll start digging it after the article I'm updating is finished.
The heroine is mute.
The female protagonist has normal outlook on life.
The heroine has a bit of a bad taste.
The heroine is actually just a cup.
Finally able to speak! The premise is to travel to other worlds!
——What are the requirements? It won't be like some infinite XX that requires completing tasks, right?
——Of course not. There is only one request!
--What?
——You can only say one sentence in each world!
——Nani? !