The Original Design of the Time Traveler Is Collapsing

Something is definitely wrong with this world. Such things should not exist in this world. This world must be in ruins. I'd better go to sleep one more time. I'll be fine when I wake up. By the personal diary of a certain world line observer and a traveler in world line N, it is a one-hit man fanfic. The timeline opens in the Evolution House chapter. The original design is collapsing. If there are magic changes, it is normal to break in.