His ego, inflated by the clear favoritism of Principal Kobayakawa, caused him to sabotage other Shujin Academy sports teams, forcing most to disband so the volleyball team would remain at the forefront. One of the casualties of this campaign was the track team; during his coaching, Kamoshida purposefully goaded them, eventually intentionally provoking one of the top team members, Ryuji Sakamoto, into violence, allowing him to break Ryuji's leg in an apparent case of "self-defense" resulting in the subsequent disbanding of the team.
