Shioh lived calmly all his 19 years. He achieved the status of Ultimate, which earned him respect and the opportunity to study at the best academy in America, Eden's Garden. Only later did he and his classmates realize that this was not just an Academy, but a killing game. Back in the middle of this game, Shioh became a traitor, working for the Headmaster Tozu because of an arrangement. Shioh follows Tozu's instructions, and in return, the Headmaster does not touch his family. In the end, the killing game ended and some of his classmates came out, but Shioh did not. Instead, he continued to work for Tozu, bringing new Ultimate students to the academy.

Recently, rumors began to circulate among the staff of the Eden's Garden Academy about an unknown girl who managed to get into the building and steal some data. Some felt fear, others admiration, but Shioh didn't care. He stopped believing the rumors a long time ago and just continued to do his job.