It has been two months since the start of the second year of high school. Yūta, Rikka, Shinka and Makoto go on a class trip by bus with the other second year students to the Island of Tsukushi, where Yūta and Rikka are notably shy about their relationship. Feeling Rikka cannot handle the romance aspect well, Yūta asks Shinka to keep watch over Rikka. At night, the other female second year students are aware that Shinka used to be Mori Summer, while the other male second year students tease Yūta about his relationship with Rikka. Soon after, Rikka ends up sneaking into the boys' bedroom and hiding in Yūta's bed, where they almost share a kiss, until Shinka gives them the opportunity to get Rikka out safely. Before returning to the girls' bedroom, Rikka kisses Yūta on the cheek. The next day, the two go sightseeing together.