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"...
I don't know whether it was an 
employee or the other children,
Jetzt ist es zwar egal, ob es ein
Mitarbeiter oder ein anderes Kind war.
No sé si fue un empleado o algún niño,
No sé si fue un empleado o algún niño,
Que ce soit quelqu’un du personnel
ou un autre enfant,
Non so se siano stati gli altri bambini
o qualcuno del personale,
Não se sabe se foi algum
funcionário ou as outras crianças.