Mei aims to become the chairperson to improve the academy, while Yuzu secretly decides to take the same university entrance exam to support her. They are step-sisters and lovers, cherishing their final year of high school together. However, Yuzu gets overly excited just by hearing Mei say "I like you," which makes their friends feel a bit anxious. Additionally, Sayaka, a junior member of the student council who harbors resentment towards the revised school rules, starts to question the hidden relationship between the two...!?