Citrus (2012)

Yuzuko Aihara is a spirited high school student whose life revolves around fashion, friendships, and carefree fun. However, her vibrant world is turned upside down when her mother remarries, forcing Yuzu to transfer to an exceptionally strict all-girls academy. Accustomed to a much more relaxed environment, the cheerful teenager quickly finds herself clashing with the school's rigid rules. Her most formidable adversary emerges on the very first day: Mei, the strikingly beautiful yet intimidatingly stern student council president, who wastes no time establishing herself as Yuzu’s primary rival. The tension between the two girls seems confined to the school hallways until Yuzu returns home, only to face the greatest shock of her young life. She discovers that the unyielding student council president is actually her new stepsister, now living under the same roof. This startling revelation completely blurs the boundaries between their hostile academic dynamic and their newly intertwined personal lives. The situation grows even more complicated when Mei unexpectedly catches Yuzu off guard and kisses her without warning. Left entirely bewildered by this sudden and intimate act, Yuzu must navigate a confusing web of emotions as she attempts to understand what this unexpected connection truly means for their future together.