Time Travel Starts with a Fight

What happens when a person gains the power to travel through time and space? What else could I do? Of course, I would travel to various worlds to torture the protagonist, take away his opportunities, break up his harem, and steal his wife. Uh, ahem, that's off track. Anyway, I just don't care about life and death. If you don't accept it, I'll do it. Newbie, new book, please support me! This book is also called The Cause and Effect System of All Realms. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.