Hi there! I'm Airdra, and I play this Hajime, who's an immortal bug monster/Kamen Rider turned "guy that runs his family's restaurant" in this world.

Hajime has a younger sister Sam's age, so if you wanted an ex-girlfriend relationship that way...XD Hajime's a pretty overprotective big brother sort, and he would have been quietly trying to terrify and/or bully Sam the entire time.