Kono Aozora ni Yakusoku wo: Youkoso Tsugumi Ryou e

Wataru Hoshino wakes up to find a girl, Rinna Sawaki, sleeping in his room. After a brief confrontation, Rinna transfers to Wataru's school and becomes his new roommate. Several students, including Wataru, are temporarily living together due to Temizugawa Heavy Industry's decision to close their aviation branch, forcing the families to leave the island within a year. Rinna initially refuses to form friendships with the others, fearing the eventual pain of separation.