Rouge, a hitman working for the Paris-based mafia "Ordre Monastique," is ordered by her superior, Lambert, to assassinate Ava Onslow—a blood relative of the former head of the now-destroyed Onslow Trading Company—in order to seize the organization’s hidden fortune.

Accompanied by her partner, Yuty, Rouge travels to Ava’s estate in the south of France. Harboring a secret desire for freedom, she infiltrates the mansion—only to encounter a terrifying “monster” of a girl.

That girl is Clophie—beautiful, innocent, and above all, terrifying. Alongside the enigmatic giant, Schramm, she shatters Rouge’s heart and body, drowning her in overwhelming pleasure that erases all pain and anguish.