In modern Japan, monsters run rampant, threatening the people. Exorcist swordsmen who defeat them can only be women, and they are revered by the people.

The protagonist, who is highly sexed and harbors daily desires for such exorcist swordsmen, is rescued by Uruha, a new exorcist swordsman, when attacked by a monster. He was overjoyed to have become acquainted with the exorcist swordsman he admired, but he is injured by a monster's surprise attack. Saeka, Uruha's mother, who once held the title of the strongest exorcist swordsman, appears just in time to help. However, the protagonist has been afflicted with a terrible curse that will eventually lead to his death. The only way to break it is to ejaculate inside an exorcist swordsman!

As responsibility for her daughter's mess, Saeka offers to be the one to do it. The best chance to get a mature, beautiful, busty, erotic exorcist swordsman has arrived. Even the strongest exorcist swordsman who has defeated countless monsters cannot beat a young dick! Thus begins an absolute loyalty, in-house impregnation cohabitation life where Saeka is defeated by his proud, tireless dick, and the older beauty is completely subservient!