Ryō Yūki (結城 亮 Yūki Ryō ) was the perpetrator responsible for the missiles fired on Careless Monday. Despite this, Yuuki is very meek and shows hesitation when forced to assist in the silencing of "Panties". He works for Mononobe as they have similar goals. Yuuki's motivation for Careless Monday was as an act of revenge against the society he hated. He was forced to work to support his ill parents and felt cheated by the system.
In The King of Eden movie, he breaks his phone, in a bid to evade Mononobe who is tracking him, resulting in his elimination from the game. He soon becomes obsessed with getting revenge against Takizawa. Since he broke his phone, his memories are not erased when the game ends. However, he is run over by Mononobe's car when he attempts to murder Mononobe for not remembering him despite manipulating him. It is unclear whether he survives or not.
|Eden of the East|
|Eden of the East||Kazuomi Hirasawa • Yutaka Itazu • Saki Morimi • Satoshi Ōsugi • Haruo Kasuga • Mikuru Katsuhara • Sis|
|Seleção|| Juiz • Mr. Outside • Ato's granddaughters |
Players:  Daiju Mononobe •  Jintarō Tsuji •  Toshiko Kitabayashi •  Yūsei Kondō •  Hajime Hiura •  Taishi Naomoto •  •  •  Akira Takizawa •  Ryō Yūki •  Kuroha Diana Shiratori •  Saizō Atō
|Others||AKX20000 • Angelika • Chigusa Iinuma • Seijiro Iinuma • Aya Iwashita • Asako Morimi • Asako's baby • Ryosuke Morimi • Misae Naomoto|
|Characters in bold are the main characters|