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"...
Besides, even if I'm not there, you've got Shima.
Außerdem hast du Shima,
auch wenn ich nicht da bin.
Además, aunque no esté, tienes a Shima.
Además, aunque no esté, tienes a Shima.
Même si je suis pas là,
tu as Shima.
E poi, anche se non ci sono io lì,
hai sempre Shima.
Eu não estou aí,
mas o Shima está.