Kenji Koiso (小磯健二 Koiso Kenji) is a math-savvy, 17-year-old high-school student and a moderator of the interactive computer world OZ, along with Takashi Sakuma (Kenji’s close friend). Kenji is less skilled in dealing with people and is relatively anti-social. Kenji is invited by Natsuki Shinohara (Kenji’s friend and the girl of his dream) for Sakae Jinnouchi’s 90th birthday with him being her fake fiancé for the family reunion. After receiving a cryptic code on his cell phone and cracking it, he becomes a primary suspect for hacking into OZ.
