When Haru gets called to visit his mother in Canada, he finds out that he has a new adoptive brother. The problem? He seems more wild puppy than human. As Haru works to gain his new brother Ren's trust, a powerful bond is formed.
While spending summer with his mother, Haru meets Ren, a boy newly adopted by his mother. Getting along with Ren isn't easy as Haru's goal is to "civilize" him by the time summer ends. Their relationship slowly improves as Haru spends more time with Ren and in return Ren steadily gives his love up to him. Can they become a "family" at the end of summer?!