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 realized that I was the 
biggest coward in the world.
merkte ich, dass ich der ängstlichste
Kerl auf diesem Planeten war.
entendí que era el 
mayor cobarde del mundo.
entendí que era el 
mayor cobarde del mundo.
que j’ai compris
que j’étais le mec
mi resi conto di essere
il peggior vigliacco del mondo.
Percebi