Ryō Yūki served as Seleção No. 10 in Mr. Outside's game. He executed the "Careless Monday" missile attacks on Japan, driven by deep resentment against a society he felt cheated him after being forced to work to support his ill parents. Despite this violent act, Yūki displayed a fundamentally meek and hesitant personality, notably when pressured to help silence "Panties." He allied with fellow Seleção Daiju Mononobe due to shared goals. During the events of *The King of Eden*, Yūki deliberately destroyed his Noblesse phone to escape Mononobe's surveillance, an action that eliminated him from the game. Crucially, breaking his phone meant his memories remained intact when the game ended, unlike other Seleção who lost their memories upon elimination or resignation. This unique memory retention fueled Yūki's obsessive desire for revenge against Seleção No. 9, Akira Takizawa, whom he blamed for his predicament. His pursuit culminated in a confrontation where he attempted to murder Mononobe for no longer remembering him despite their past alliance. During this encounter, Mononobe struck Yūki with his car. The outcome of this incident, specifically Yūki's survival, was not definitively confirmed.