The protagonist Sachiko Tachibana (Nozomi Sasaki)) vows to fight against the demon-like ruthless monster Hanai Rina (Shibuya Nagisa)act) revenge.In high school, Sachiko was teased as the daughter of a murderer, and Rina became her only friend.However, behind Rina's angelic and gentle smile, there is a face of a murderous demon who easily kills people.Rina charged Sachiko and her father with murder, and also took the life of Sachiko's father.

14 years later, Sachiko, whose appearance has completely changed from her past, once again confronts Rina, who has become a new mother.“Let her taste the taste of living hell”, Sachiko enters Rina's family as a nanny.Can ordinary people who devote their lives to revenge drive monsters to destruction?A heroic revenge drama with repeated setbacks and entanglements begins.