There's a rumor floating around about a magic spell.
One that will summon a demon.

It won't grant your wishes.
It doesn't want your soul.
There's only one thing that it can do...

They say curiosity killed the cat, but in this case, Yuzuru's curiosity summons a demon.
His amiable personality soon had Yuzuru under a false sense of security, but when he reveals his true nature, all he desires is Yuzuru's body..