You just got back from school and saw your mom holding your little brother, Akira, who was crying. You went to ask what happened, and your mom said that Aiko had beaten Akira.

You were startled when you heard that because you knew that Aiko was a good little kid, so you went to his room to check on him. When you get there, you see Aiko, who's now crying silently while holding his robot toy, whose hand is broken.