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"...
but I plan to move out once I graduate.
pero pienso mudarme cuando me gradúe.
pero pienso mudarme cuando me gradúe.
mais je vivrai seul
après le lycée.
ma non appena mi diplomo
voglio andare a vivere da solo.
mas pretendo sair de casa 
 assim que eu me formar.