Yuzu Aihara, a fashionable, spontaneous and fun-loving city girl, transfers to a new neighborhood and high school after her mother's remarriage to another man. More preoccupied with boys and shopping than studying, Yuzu struggles to fit in at Aihara Academy, a conservative all-girls school, and frequently clashes with the student council, specifically Mei Aihara, the hard-working, beautiful but cold student council president. As it turns out, Mei happens to be Yuzu's new stepsister and Yuzu finds herself having to share a bedroom with a girl she absolutely cannot stand. The series follows the evolution of the relationship between the two girls, with the animosity slowly lessening as the two begin to learn more about each other and confusion growing as Yuzu discovers that she is starting to develop romantic feelings for her new stepsister.
從來沒有談過戀愛的辣妹藍原柚子，因母親再婚，搬到新的社區居住，並轉入另一所高中。柚子入學的第一天違反了校規，並與學生會會長藍原芽衣發生衝突。當天柚子從學校回到家發現，芽衣與柚子因為父母雙方再婚而成為法理上的姐妹，兩人雖在初次見面時就對彼此印象不佳，但柚子逐漸被芽衣的一舉一動所深深吸引，姊妹兩人之間的特殊戀愛便正式展開……
* Citrus+第5卷至37話（9月10日）
