Comprehensive Manga Kaneki Ken's Journey to All Realms

Just like the title, the story is about the main character traveling through time and becoming Kaneki Ken to obtain the system and then travel to the second dimension. It may be a harem. We have one or two female protagonists in each world. If you don't like it, don't enter. If you think it doesn't look good, feel free to come and troll me. I'll give you ten sentences for a month. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.