On her 16th birthday, Asagiri Kanna, a shy and bullied girl is abducted and taken to attend a new school. There she finds out she has been promised to marry the demon king, Kaki Kitou. Neither of them seem to be happy about it.

20 years before the events of the original story, another girl discovers that she’s been kidnapped by a demon that plans to be her groom.

When she’s jilted by her demon fiancé, a would-be bride swears revenge against her kidnappers with the help of another Oni who wants to kill the chief of the demons.