Yamakado

Yamakado serves as the second-year grade supervisor at Tatebe Gakuen High School, whose imposing aura has earned him the unofficial nickname 'King of the Underworld' among students. As a mature man who has experienced the end of a marriage, he possesses a keen eye sharp enough to detect the unusual dynamic developing between Murai and Teacher Tanaka. Despite projecting a cold and distant exterior, he harbors the considerate nature and quiet charm of a seasoned adult, making him a pivotal supporting figure in the story's progression.