Shinri Saeki
Yousuke's brother, and the Chairmen of the school Board after his father's term ends. He is very strict, and is incredibly sharp. He launches an investigation of Momoko, and informs Itou that if he gets involved he will share the same punishment as her unless he can prove that his own protection is not more important than protecting Momoko. When Itou refuses to back down after the threat of expulsion, Shinri accepts it and overlooks the entire situation, allowing Akira and Momoko to switch back without punishment. (Source: Wikipedia)