A naive classmate initially bullied by Naoko. Rio manipulates her into joining their clique and compensated dating scheme. Tomoko later shields Rio from Naoko's attack and reconciles with her after Rio confesses to orchestrating the bullying.
Naoko projects her jealousy onto Tomoko, viewing her as the cause of Rio's departure.
Tomoko is initially drawn into Rio's group through manipulation and shared delinquency.
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