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: Inyouchuu 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...

Third Season: Inyouchuu Etsu
Japanese Title: 淫妖蟲 悦～怪楽変化退魔録～

One day, Yamato, Mikoto and Takeru visit a village in the mountain for the training to be monster hunters. They have various hard trainings and finally become the monster hunters. But there is something wrong with Yamato's body. His body gradually changes into a monster... what is happening to his body? Who can stop it? To save Yamato, Mikoto and Takeru make every effort to do so. What is the secret to Yamato's body? What will happen to Mikoto and Takeru?