Boy #16 is a sleazy, awkward boy. In the novel he is a member of the soccer (football) team.
Kazushi kills Yoshio after finding him unconscious, and then comes upon Takako Chigusa. In the novel and manga, aside from desiring to rape Takako Chigusa, he attempts to shoot her when she runs from him. A vicious fight ensues, and ends with Kazushi being impaled with one of his own arrows.(Source: Wikipedia)