Ryo Yuki, designated Seleção No. 10, emerges as a central antagonist orchestrating the Careless Monday incident—a calculated strike launching ten missiles across Japan without casualties. His vendetta against societal structures arose from personal anguish: forced labor to sustain his ailing parents and perceived systemic exploitation. Partnering with fellow Seleção Daiju Mononobe, he weaponized the attacks as retribution, framing their collaboration as righteous rebellion.

Post-Careless Monday, Ryo persisted in alliance with Mononobe, their ambitions escalating to deploy sixty additional missiles. Unmasked as masterminds, their scheme collapsed under Akira Takizawa’s interference. In *The King of Eden*, Ryo shattered his Noblesse phone to escape Mononobe’s surveillance, forfeiting his Seleção status yet retaining his memories—an anomaly among ex-participants erased upon exit.

Memory preservation fueled his vengeful spiral. Blaming Takizawa for his ruin, Ryo fixated on retaliation. This obsession drove him to target Mononobe, now a stranger stripped of shared history, culminating in a fatal confrontation where Mononobe’s vehicle struck him—leaving his survival uncertain. Ryo’s trajectory unravels from coerced conspirator to desperate avenger, clawing for agency within a system he deemed merciless, his defiance etching a path from collaboration to self-destructive fury.