This is a crucial time when females are endangered and being kept away in a place where they are being taken care of to secure reproduction. The place is called Owari No Seraph. Escorts, or males that are trained well to have these females as their partners, are being looked up in the society. There's a famous school who specialized in training young Escorts in Japan - Seraph Private Academy.
Yuuichirou, a 16-year-old boy, who dreamed of becoming an escort, entered the Academy with the help of his foster parent, Guren.
He met one of the Seraph's student, whose name is known throughout the whole school - not only because he's very attractive, but also because he's sweet, cute, the kind that the boys would go crazy for. That was Mikaela. But Mikaela has a different side which only Yuuichirou knows.
Yuuichirou was claimed by the famous and evil student to be his boyfriend. That was only the beginning. For the school has one absolute rule:
FALLING IN LOVE IS STRICTLY FORBIDDEN.