Citrus. Volume 4 secret love affair with sister

"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,...