What would you do if you could share your mind with "you" in a different parallel world?
Yan Bing: Focus on studying and make progress every day.
A certain happiness system for all mankind: No, no, no, our goal is to make all mankind happy!
Yan Bing: Where did the late stage of chuunibyou come from? Rolling, rolling, numb!
In fact, this is the story of a (later stage) Mary Subensu girl who can step on Thanos and punch Voldemort, making all mankind happy (laughs).
Ps. The existence of the system is ignored. There is a love line. The male protagonist is different in different worlds. The female protagonist can communicate with her "self" in the parallel world, but they are not the same person, so please don't say that the female protagonist is half-hearted. Thank you (laughing).