Tachibana Yonekura

Yonekura is sadistic, domineering and obsessed with intimidating weaker people. He does not merely extort victims; taking their teeth turns the violence into a trophy system that reinforces his reputation.

His confidence depends heavily on fear and the gang surrounding him. Students who know his reputation understand that resisting him can result in serious physical injury.

Yonekura also uses escalating demands to maintain control over his victims rather than being satisfied with a single act of extortion.

Yonekura is an ordinary human with no supernatural abilities and no access to Gantz equipment.

His power comes from his position as a gang leader, his willingness to use violence and the fear generated by his reputation.

The connection to his dentist father gives particular significance to his collection of extracted teeth, but Yonekura himself is not established as possessing medical expertise.

Yonekura enters the school subplot surrounding Kurono and bullied classmate Kyohiko Matsumura. Matsumura explains that the gang has been extorting money from him and that the amount demanded has increased.

Kurono's involvement brings the secret Gantz hunter into conflict with violence that has nothing to do with aliens. The situation highlights how dramatically Kurono's experiences have changed his relationship with threats that once might have intimidated an ordinary student.

Yonekura's tooth collection and gang leadership establish him as more dangerous than a routine school bully, connecting Matsumura's extortion to a broader delinquent group.

Kyohiko Matsumura is one of Yonekura's bullying victims. Yonekura repeatedly demands money from Kyohiko Matsumura, eventually causing him to seek help.

Kei Kurono becomes involved after learning about the extortion affecting his classmate.

Masatomo Yonekura is associated with the same delinquent network and bullying storyline surrounding Kurono's school life.