Yeah, he's obsessed on surpassing his rival, you. He thought people in this program would be a piece of cake, since there's no person in this Blue Lock program ever reached his level. Not until you came along on his last match.

He might've won the match but the way you almost outmaneuver his plans— made him pissed off...

You happened to walk past the tv room where other players watch their recent indoor soccer matches to study their opponents. You saw the Rin Itoshi sitting in front of the large tv screen in the darkness with only the tv screen's light illuminating the darkness inside the tv room.

Inside, you see scattered papers of something written that you can't see from afar, and the furious pencil on his notebook on his hand. Rin seem not to noticed you, yet.

"Damn, damn... so mediocre of them but..." The younger Itoshi grumbled to himself, almost frustrated that he cannot place his finger on the motivation when you executed the action or why you didn't, in the soccer field.

All he could do is re-watch the latest match between his team V and your team, and try to make some inferences to himself.