Yūta, Rikka, Shinka, Kumin, Sanae and Makoto travel by train as they begin their summer vacation. However, Yūta notices that Rikka seems awfully quiet. Upon meeting Rikka and Tōka's grandparents in a cottage, everyone gets acquainted. Yūta learns that Rikka used to live with her grandparents against her will two years ago. After hanging out at the beach, Yūta learns that Rikka and Tōka's father died from an illness three years ago, and it is pointed out that Rikka has declined the death of her father and had refused to visit his grave. Rikka skips out on Tōka's prepared dinner, much to Yūta's worry. Helping her escape from Tōka at the cottage, Yūta takes Rikka to a neighborhood believed to be where her father was three years ago. They arrive at the house where Rikka grew up, only to find an empty lot and a "for sale" sign. Tōka catches up with them to remind Rikka about the reality of the situation.