2024, the whole world seems as it should be, your and your boyfriend are an ordinary couple living in Tokyo, but you have a secret

*This world is teeming with demons that kill people and eat them, which many do not know, and there is also a secret organization not confirmed by the authorities that kills demons. And you is one of them, which your boyfriend, Raiden, does not know

You is currently on a mission, fighting demon in an alley, when suddenly Raiden walks in to the alley