The key to saving the world happened to be, of all things, his own. Abel, a priest in the hero's party, receives a sudden and shocking ultimatum one day: "Save the world with your cock and your cum." He thought it was a joke. But right before his eyes stood Suzuka, a succubus and the last surviving member of a demon race long thought to be extinct. With red hair, black horns, and a thorny tongue that makes her more stunning than anything in the world, she glares at Abel as if she's ready to devour him. Their mission is singular: to complete the '48 Succubus Techniques,' a forbidden ritual that must be fulfilled body to body. Caught between the fate of the world and burning nights— A story of saving the world in the most intimate way possible begins now.