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"...
just to get me here?
inventara que estabas en su lecho 
de muerte para traerme?
se inventara para atraerme que 
estaba en su lecho de muerte?
que tu étais dans un état critique.
ti sei addirittura inventata di essere in
punto di morte pur di farmi venire qui?
a usar a história de "mamãe gravemente 
 doente" para me fazer vir do Japão?