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He is a penitentiary officer at the prison where Takashi Sugimura was held in until he lost his temper with the imprisoned Otoya Kurenai after being knocked out by him and was forced to reveal himself, attacking his fellow officers while going at Otoya until Yuri Aso arrives with the Ixa Knuckle that Otoya uses on him.
- Sanjō's name comes from Momotaros' catchphrase "Ore, Sanjou", both of whom are played by Seki himself. The other three Taros' voice actors were also given a cameo in the movie with a reference to their catchphrases somewhere.