Yuzu Aihara is an attractive girl who transfers to a new high school because her mother remarries. Yuzu had been looking forward to this day, dreaming of a sweet love story. However, her fantasies were shattered. The new school is known for its conservatism, and the local school council president, Mei, is known for her strictness. On top of everything else, Mei, whose last name is also Aihara, turns out to be her new stepsister. Will Yuzu be able to sort out her personal life and realize that it’s only one step from love to hate?