Kono Aozora ni Yakusoku wo - S01

One morning, Wataru Hoshino found a girl sleeping in his room, wearing nothing but her underwear. When she woke up, she quickly escaped by jumping out of the window, but not before punching Wataru in the face. This girl, Rinna Sawaki, turns out to be a transfer student at Wataru's school and the new roommate at his dormitory. Wataru lives with four other girls and their school teacher, but because Temizugawa Heavy Industry is shutting down its aviation branch, the major company on South Sakojima Island, the families connected to the corporation have to be evacuated within one year. As a result, the four girls have to leave the island in a year. Knowing this, Rinna refuses to become friends with Wataru and the other girls, because of the pain she might feel from their eventual separation. However, Wataru disagrees with her, and over the course of the year, he tries to convince her otherwise.