The Ultimate Series: I Traveled Through Time

I thought that I was an otaku, always fantasizing about time travel, but one day I was hit by a car because of a child, and when I woke up later, I couldn't help but start to ponder, what on earth do I exist, or is the order of time and space changed because of me. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.