Daiya Oomine

A self-centered and arrogant student who dyes his hair silver and wears three piercings in his right ear. He is also the class president and a shrewd friend of Kazuki’s.

Daiya used Kamiuchi and his box in order to learn how to master his own. He tricked Hoshino into believing that he was the real owner. He kills Kamiuchi which terminates the box. (Source: Baka-Tsuki)