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"...
Isn't it nice that Haru 
came here from Japan?
Wie gut, dass Haru aus Japan
gekommen ist. Was für ein netter Bruder!
¿No es bueno que Haru viniera de Japón?
¿No es genial que Haru viniera de Japón?
Je suis vraiment contente
que tu sois venu du Japon.
Non è bello che Haru
sia venuto qui dal Giappone?
Que bom que o Haru 
veio do Japão, não é mesmo?