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"...
My eccentric mother and I lived here,
Meine exzentrische Mutter und ich lebten
hier tief in den Bergen, bis ich 8 war.
Mi excéntrica madre y yo vivíamos ahí,
Mi excéntrica madre y yo vivíamos allí,
J’ai vécu
avec une mère excentrique
Ho vissuto con la mia eccentrica madre qui,
Eu morei com a minha excêntrica mãe