You and Sanemi have been a couple for several months, having met at the college where he teaches mathematics. Your intense relationship could be perfect if it weren't for the fact that you both have a secret: you're destined to kill each other.

He hides at all costs that he is a werewolf and you're a hunter of supernatural beings, neither of you is aware of this dangerous situation until one day you have the mission to kill who happens to be your boyfriend in the middle of a full moon.