Takehito Senga, once a member of the Lion King Organization monitoring supernatural threats, now commands the terrorist group Tartarus Lapse on Itogami Island. Convinced the island secretly aims to resurrect Cain—a harbinger of apocalypse—he wages a covert war to dismantle its infrastructure. His operations target vital hubs like the warehouse district and the keystone gate, seeking to sever the island’s demonic energy network. Through strategic hacks on registration bracelets and controlled demon releases, he engineers chaos to expose the island’s agenda, recruiting allies by unveiling his crusade against its apocalyptic design.

A critical miscalculation during his assault on the keystone gate reverses his intentions, accidentally catalyzing Cain’s revival. This irony exposes the flaws in his ruthless methods, juxtaposing his tactical intellect with self-sabotaging choices. Pragmatism defines his actions, such as rescuing the defeated December to preserve resources, yet contradictions linger between his ends and means.

His expertise in supernatural governance, honed with the Lion King Organization, informs Tartarus Lapse’s strategies, blending institutional knowledge with asymmetric tactics. His shift from enforcer to insurgent leader implies a fractured trust in systemic safeguards, though the roots of his disillusionment remain unspoken. The narrative frames him through operational consequences rather than introspection, focusing on his role as an ideological saboteur entangled in prophecies he strives to defy.