|School||Tamaoka Prefectural High School|
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Hideki has black eyes and has dirty blonde hair. He wears the standard male uniform for Tamaoka High School.
It is known that an order was sent by the King that Hideki was to touch Satomi Ishii's breasts, however, she avoided school, supposedly because of illness, in order to keep him from doing so, which led to both parties deaths by hanging.
- He was Student #18 in the class roster for Nobuaki's old class.