Hara Miko Shimai (孕ら巫女姉妹)

The protagonist, Akira Yamanabe, after graduating from university, set out on a journey by himself. Somewhere along the road of that journey, around an unfamiliar rural area, he accidentally arrives upon a shrine, where he gets possessed by an evil perverted spirit that should have been sealed away. Soon after, dirty thoughts start running wild throughout his mind and in order to exorcise the evil spirit, he asks the local shrine maidens, sisters Hazuki Kagura and Uzuki Kagura, for help, to try and purify it, so as to further prevent it from engaging into any perverted acts…