Seiji Matsuoka

Seiji Matsuoka is a second-year student at Sasebo Higashi High School, raised in a financially struggling household with numerous younger siblings. Driven by the desire to support his family, he harbors a burning ambition to move to Tokyo and make it as a professional entertainer. To prepare himself, he has been deliberately training to eliminate his regional dialect. Known for his bold, theatrical personality and unwavering self-belief, he once extended an invitation to Chintaro to join his rock band 'The Olympos,' positioning him as a pivotal figure who ignites musical clashes among the main cast.