石原 優

A freshman at Seishou Academy. His personality is too serious, but somehow he's kind of airhead. Masaru admires Hayashida Kyouhei, which is the reason why he joined the baseball club despite of not athletically good. By the advisor order, Masaru becomes a cross-dressing manager, and is called "Yuu". "Yuu" is now becomes the obedient, sexual urges target of teachers and fellow members.