[Hijikata Jūshirō & Okita Sougo] Fanfiction
Parallel worlds are the same as the original living space. They can also be understood as "refracted reflections". They do not affect each other and develop toward the original track at different speeds. Things in the future may be happening now in a certain space-time with the highest speed.
Note: If you accidentally enter another parallel time and space of your own, the self in that time and space will be squeezed into another parallel time and space. In other words, no two identical people will appear in the same time and space.
Conception: