Chairman Sakayanagi

is the school chairman of the Advanced Nurturing High School.

Plot
He made his debut in Volume 7 during the meeting between Professor Ayanokoji and Kiyotaka. He told Professor Ayanokoji that according to the rules of this school Kiyotaka can't leave unless its his own wish or he is expelled. He later also revealed that Kiyotaka was given admission to this school under his approval.

During Volume 10, he was placed under house arrest due to unknown reasons and Tsukishiro was appointed as the acting director of Advanced Nurturing High School.