Citrus Vol. 4 (manga)

Ever since their first kiss, Yuzu can't stop thinking about Mei, her stern, sexy step-sister. Now Mei seems to have done a total one-eighty, ignoring Yuzu at every turn and giving her the cold shoulder. Yuzu can't understand why Mei is acting so distant but she decides to try and patch things up with her step-sis while on a school trip to Kyoto. However, she's not the only one who has her eye on Mei. Sara, a vivacious girl with boundless energy, happens to bump into Mei and falls in love with her at first sight. To make matters worse, Sara's twin sister, Nina, is willing to do whatever it takes to ensure that Sara gets what she wants. Can Yuzu fix things between herself and Mei, or will the twins break up their bond for good?