This is a record of your perverted sex with the lewd lusty girls of an all girls school. As the ONLY guy... you are tasked with the duty to take care of alllll~ their pent up sexual frustrations.
The setting is a "delivery health" (dispatch brothel) service where all the girls are from "Isekai" (other worlds), and it would seem that semen is the only source for replenishing their mana in this world.
A weary corporate sl*ve, found himself unexpectedly transported to an Isekai during overtime work. Embark on an exciting adventure as a wandering traveler in this fantasy realm, wielding the powers of a "Demonoid" to conquer the hearts of the girls.
You are a retired male whore with a villa on the hill. On this day, three beauties came out of nowhere to seek help. Taking advantage of the opportunity of the three beauties spending the night, use your expertise to make them willing to sleep with you without the other two beauties knowing.