In a world plagued by the Incubus Disease—a condition where suppressed sexual desire turns humans into monsters—a young woman named Aria is initiated as an Exorsister. Armed with a holy Stigma, Aria embarks on her first mission to cleanse the infected and provide "salvation" through intimate healing. After successfully treating several townspeople, she sets her sights on the great temple to further her sacred duty.
Aria continues her journey to the Great Altar, encountering infected individuals who require her unique "treatment" to be cured of the Succubus Disease. By assuming the roles of a lover and a supportive priestess, she helps a lovestruck man and a fallen "Hero" regain their humanity. Despite her success, Aria begins to question the nature of her Stigma and the blurring line between her divine mission and her own growing lust, though her resolve to save others remains steadfast.
Aria continues her journey toward the Great Altar, encountering infected individuals who have succumbed to the Succubus Disease. To cure them, she employs her unique treatment methods, adopting the roles of a devoted lover and a supportive priestess to satisfy the patients' desires and purge the infection. Despite her success, Aria begins to question the true nature of her Stigma and the line between her divine mission and her own growing lust, though she remains determined to save everyone.