"Succubus Blight"—a vile disease rampant across the continent. Those holy beings possessing the power to quell this affliction were known as "Exo-Sisters." Aria, a novice Exo-Sister who had sworn to fulfill this mission, set out for the distant Grand Temple to eradicate the blight once and for all. "I will become an Exo-Sister and save the people from the Succubus Blight!" Bearing the "Holy Stigma"—proof of divine blessing— Aria uses the sacred power within her body to heal and save the infected who have transformed into monsters. Her actions are strictly medical treatment. Even if she experiences pleasure— even as her bountiful, massive breasts jiggle, her voluptuous buttocks bounce, and her face melts into an expression of ecstasy—it remains, above all, a sacred act. Do your best, Aria! To wipe out the Succubus Blight, you must engage in plenty of wet, squelchy sex! Wielding the "Holy Stigma"—the mark of divine favor— my mission is to save the infected who have turned into monsters! Ah... aah... ♡ This sacred act (sex) is... ...of course, all for the sake of eradicating the Succubus Blight. ♡