Reincarnation, starting in Tensura

Well this is my first time writing a
fan-fic and I am a tensura fan so I thought to start with that.

I will go to whichever universe I like in this fic, it can be anything, anime, movies, anything really.

I do not own Tensura or anything else.
Just the OC is mine.

Update are sporadic.
Don't know about harem or not harem stuff right now.
Write your suggestion, maybe I will comply.