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"...
She took me in.
Sie hat mich aufgenommen.
Me acogió.
Me acogió.
C’est elle qui m’a recueilli.
Mi ha preso con sé.
Ela... Me adotou...