Takeaki Kiryū, cousin to Tatsuo Nagumo—host of the Chōjin—emerges as a pivotal figure when Faust Münchhausen II uncovers his role as the living vessel for the Kyō-Ō, an ancient malevolent force older than the Chōjin. This bond arises from a coerced blood transfusion using Nagumo’s Overfiend-tainted blood, orchestrated by Münchhausen II to catalyze the entity’s resurgence within him. His harrowing past traces to a demonic assault aboard a flight to visit family, where tentacled horrors devour his parents, leaving him traumatized and vulnerable. Münchhausen II exploits this fragility, twisting Kiryū into a puppet through psychological and physical corruption. Under external influence, he enacts brutal violence—rape and murder—against loved ones, mirroring his escalating loss of self. Amidst the turmoil, he forms a fraught romance with Megumi Amano, a beast-human hybrid. She strives to anchor him as the Kyō-Ō’s influence manifests in grotesque mutations, including a horn erupting through his eye—a visceral emblem of his fracturing humanity. The conflict peaks atop Shinjuku Skyscrapers, where Megumi confronts him in a lethal clash. Despite their bond, she delivers the killing blow to halt the Kyō-Ō’s ascension, cementing his tragic fate as a tool in Münchhausen II’s vendetta. Exclusive to the anime, Kiryū’s arc dissects manipulation, eroding identity, and the fallout of cross-dimensional warfare, framing him as a casualty whose autonomy is methodically stripped by forces beyond his control.