Based on the CG collection by loopsoft.

The exorcist, Masurao Kongou, visits an eerie abandoned school building in a certain town. A ferocious evil spirit known as Hanako-san is said to lurk there. Hanako has gained mighty spiritual power and can even change her once juvenile appearance! Big breasts that pushed up on her shirt were sandwiched between suspenders. Thick thighs extended from her skirt and her big ass protruded greatly. Hanako is covered in grudges from her past human life, but Kongou does not give in. He’s managed to put his holy power into his cock in order to purify the evil spirit with semen!

(Source: Getchu, translated and edited)

Note: A live-action AV adaptation (MIMK-070) was released on October 1st, 2019.