Gokusen (2004)

Kyo-san's Great Act? (1x6)

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Shin and Kuma see Kumiko get into a car with two people who are part of the Ooedo clan. They follow her to her house but are caught and Kumiko and the clan put on a act so Shin and Kuma won't find out anything. Kuma falls for the act but Shin finds out the truth but promises to keep it a secret.