Tsukishiro

Tsukishiro is the acting director of the Advanced Nurturing High School, after Chairman Sakayanagi's temporary suspension.

History
Tsukishiro was sent to the school by Kiyotaka Ayanokōji's father, Professor Ayanokōji, as the acting director in order to get Kiyotaka expelled and return to the White Room.

Plot
Tsukishiro made his first appearance in volume 10. He appeared in the special building, in front of Kiyotaka and Arisu Sakayanagi while they were talking about the circumstances of the special exam that had just ended. He asked for where the staff room is, then proceed to introduce himself as the new acting director of the school. After exchanging some words, he started walking past them and suddenly kicked Arisu's cane. Kiyotaka caught her but got pushed by Tsukishiro against the wall right after. Arisu asked if acting violently against the students would be a problem, to which Tsukishiro replied that the surveillance camera had been replaced with a false image. He then gave Kiyotaka a message from his father, threatening him to come back. Tsukishiro continued provoking Kiyotaka but he did not retaliate, in case the camera was actually still recording. Tsukishiro then released Kiyotaka and left, announcing that he'd formally start working at the school in April.

Trivia

 * His first name has not yet been revealed.