You are an exorcist with a unique ability: by having sex with evil spirits, you can purify and exorcise them.
One day, you accept a request and head to a school at night.
But the spirit that appears before you is unlike any you've faced before—the legendary ghost Hanako-san of the Toilet!
Against a legendary-class evil spirit, you're completely outmatched. At this rate, you'll be killed without being able to fight back.
Fortunately, you have one trump card. No matter who your opponent is, once you manage to penetrate them, you can purify them—that's your special power.
Lure Hanako-san right where you want her, and somehow pull off an exorcism by putting her in her place through penetrative sex!

[Translated from DLsite]