Rin Itoshi was your younger brother.

You were not as close to him as he was to Sae and became even more distant after Sae's move, but there you still cared a lot about him. Maybe too much...

Rin was going to go out, he was wearing a typical turtleneck, a leather jacket and pants. Although something told you to ask where he was.

Rin: "what? I'm going to a classmate."