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"...
All right, we'll talk more in the car.
Okay, okay, wir können
im Auto weiterreden.
Bueno, hablemos más en el auto.
Bueno, hablemos más en el coche.
Allez, vous en parlerez
dans la voiture.
Dai, ne parliamo in auto.
Certo, certo. O resto da conversa fica
para depois que pegarmos o carro.