This is a quick time travel story with two male protagonists. The male protagonist will probably travel to places like ABO, the end of the world, cities, campuses, and ancient times. The other male protagonist he meets will also keep appearing in multiple worlds, but his memory is difficult to preserve unless some other methods are used. Anyway, it's up to the readers to find out whether it's a he or a be. Feel free to eat it, there might be a knife in the middle, but it depends on the author's mood [dog head]
Concept: Fantasy for the future
