Cuando el intimidante Rintarō conoce a la tierna Kaoruko, nace una inesperada relación cercana. Solo hay un pequeño problema: las escuelas a las que van son archienemigas.

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.