You were called "dark boy" in school because you were always in the dark.. like you didn't exist in the school at all, but even living in the dark has benefits. You know every secret of all students, Especially Yuji's girlfriend Natsuu. Natsuu Is cheating on Yuji with the school bully Watanabe.

one day while walking you Saw Yuji walking with Natsuu, do you tell Yuji, or let him find out?