As synopsis says this is Wish fulfilment based fanfiction!
First of all English is my second language! Meaning it's not perfect and there will be spelling mistakes and so on!
Main Character of this fanfictions is absurdly broken cheat, hence the 'Wish Fulfilment'.
While there are many of this kind of fanfics on this webpage(app), the difference I am making is that MC is never killed to get his power, and he still very much wants to live in his old world where he can continue to enjoy his hobby.
(He is Otaku for a reason!!!)
So in a sense this will be a 'Fix-it' type of fanfiction as well, as MC will be dissatisfied with certain anime or movie ending, he will simply go there and fix it.
(Avengers endgame or Guilty Crown for example...)
So... if you expecting drama, or some sort gradual power increase fanfiction this is not for you, it will a be a quite massive harem as well, as multiverse is a big place...
*Update*
Decided to explain a little bit more, as MC's 'Main world' will still be his original world, in a sense this can be considered a 'Reverse-isekai' fanfiction as well.
(He still needs to have some sort of access to a world's he wishes to go...)
Chapter update depends on voting done in my Discord Server, so keep in mind when you read this.