This Romantic Comedy Changed Genre to Isekai Modern Fantasy

Reincarnated into some side character character from romantic comedy... at very least it was new chance for life and, moreover, I had some hypothetical knowledge about future. I didn't really have any right to ask for more, even if I was slightly disappointed. Fortunately, or unfortunately, it turned out this wasn't all and I was gifted with an opportunity to self-improve and gather supernatural abilities with a help of a system managed by myself. All I have to do is... saving worlds? Multiversal fanfiction started with reincarnation into modern anime world as Zaimokuza Yoshiteru from OreGairu.