Having come to Canada upon hearing the fake news that his biological mother Haruko is in critical condition, high school student Kaidou Haru meets a young boy named Ren. "You have a new brother. Take care of him." So instructed by his mother, Haru is forced to spend the summer with Ren. Every day is a battle with Ren, who refuses to listen to anybody. However, as Ren grows to like Haru little by little and Haru comes to adore Ren as well, they make a certain "promise"...
Haru? Are you all right?
Haru? Alles klar?
¿Haru? ¿Estás bien?
¿Haru? ¿Estás bien?
Haru ?
Haru? Stai bene?
Haru? Você está bem?