Orihara

In elementary school, he attended the same judo dojo as Hayase Nagatoro. His first name is unknown. He considered Nagatoro a rival, often challenging and losing to her, but gradually became stronger and eventually defeated Nagatoro, growing into an Olympic candidate. This defeat prompted Nagatoro to distance herself from judo.

During the school's judo tournament, they reunited as opponents, unleashing a fierce battle against his once-rival Nagatoro. In the end, Orihara won, but the frustration of defeat fueled Nagatoro's resolve to join the judo club and seek revenge. Away from judo, he is a cheerful person appropriate for his age, and during breaks, he enjoys teasing about Nagatoro's love life with Gamo-chan.