The strongest orgasm lifeform "Shito," threatening Earth, suddenly appears! His goal: to exterminate every man on the planet. As humanity faces extinction, a lone girl rises to confront the terror, donning a combat suit. She takes on the solitary battle against Shito's brutality. Driven by an insatiable hunger for life essence, Shito grows more ferocious, sending a new assassin to face the girl. Their clash escalates into a life-or-death one-on-one battle.