To be in Love is the 17th chapter of the Citrus manga. It was released on July 18th, 2015.
After the field trip to Kyoto, during which Mei acknowledged Yuzu's confession and feelings, the sisters come back home. In the morning, Yuzu watches Mei sleeping, and thinks she looks cute. They walk to school together, but are interrupted by a fan of Yuzu from Junior High School. Later on, Harumi tries to convince Yuzu to give up her Gyaru style, fearing her sister's visit to the school. Back home, Yuzu finds out that Mei told their mother about her fan. After talking to Mei and her mother, Yuzu accepts and dyes her hair black. Harumi is happy for Yuzu, but they find out Yuzu's fan has now followed her model, and shows up with bright blonde hair for her new first year school term.