Inyouchuu

First Season: Inyouchuu ~Ryoushoku Gakuen Taimaroku~ The Animation
Japanese Title: 淫妖蟲～凌触学園退魔録～

Three students are in a school late at night fighting supernatural enemies. As they are about to leave, they get attacked and trapped. Based off the Inyouchuu game.

Second Season: Inyouchu Shoku
Japanese Title: 淫妖蟲・蝕 ～凌触島退魔録～ 壱の巻

The demon hunters are back! Mikoto, Sui, and Takeru are sent to investigate a mysterious island where people have been disappearing repeatedly and dark yoma are rumored to be the cause. When the team first arrives it almost feels like a vacation to them, but it doesn't take them long to the feel the presence of something dark and evil...