Kazuya Yamamura

Oga's new underling. A first year at St. Ishiyama Academy.He looks up to thugs and gangs, and so changed his image to replicate them. He is studying the "way of the delinquent" under Oga. Azusa is his old friend. He deeply admires Oga as the best hoodlum around and their first contact is when Oga and Kunieda save him and his friend Azusa from harassment by Teimou students. He then kowtows to Oga and begs to become his underling. After some insistence and flattery, Oga ends up accepting his company. He also admires Furuichi, to the latter's delight, calling him "The Strategist Furuichi" as he thinks that he plans strategies when Oga is fighting.

His plot role so far has been mostly comic relief and as an information source on the Six Knights.