What happens when a dragon slayer from Earthland become the familiar of Louise the Zero?

you are a Grim reaper, and you hold the title "the decayed reaper" after collecting many souls then the other grim reapers in the realm of the dead, but what happens when a student from magic academy accidentally summons a second familiar. this story takes place after season 1 where Saito decides to stay with Louise.

This is a Familiar of Zero (x male reader) Description: (Y/n) is just a normal guy...ish. one day he's summoned to a different world by a wizard as a familiar. (Y/n) has a secret that only a few people know about. His secret is the reason why he was turned into a familiar. But what's his secret?. And will his master and others fall for him? Reference: (Y/n)=Your name. (L/n)=Last name. (E/c)=Eye color. (H/c)=Hair color. (H/l)=Hair length. I do not own The Familiar of Zero nor do I own any pictures or anything used in this book. I just own the story itself.