Münchhausen II inherits his mad Nazi scientist father's diabolical legacy after the latter perished serving Adolf Hitler. He pursues world domination by attempting to resurrect the Kyō-Ō (Lord of Chaos) through merging it with the demon Faburil, though these experiments ultimately collapse. His arsenal includes psychological manipulation and mind control, coercing Takeaki Kiryū into serial rapes and murders to advance apocalyptic objectives. Following the Overfiend's rise in a post-apocalyptic era, Münchhausen II subverts its dominion by weaponizing advanced technology and ancient prophecies. He breaches NASA systems, deciphers hieroglyphs for tactical leverage, and manipulates Yoenki by framing Amano Jyaku for her brother Suikakujū's death to incite vengeful fury. His stratagems escalate to detonating an atomic bomb over Osaka to sabotage the Overfiend and deploying the Genocydroid D-9 cyborg enforcer to impose his rule. Münchhausen II's ambitions implode during a final confrontation where the Overfiend overwhelms him. Empowered by a ritual utilizing reanimated corpses and Megumi Amano, the Overfiend shatters Münchhausen II’s machinations, halting his crusade against the prophecy unifying the three worlds. This character exists solely in anime adaptations, absent from the original manga. His narrative spans *Urotsukidōji III: Return of the Overfiend* and extends into later entries like *Urotsukidoji IV: Inferno Road*.