Una escuela de élite para chicas está junto a una escuela para chicos problemáticos. Un día, dos estudiantes de ambas escuelas, Kaoruko y Rintaro, se conocen y desarrollan una conexión.

Marie thinks that she is being used as a substitute fiancée for her lost sister Anastasia; due to her parents breaking her self-worth. In truth, she was the one the proposal was meant for; the sender had mixed up their names.