Takahashi Tetsuo, a biology teacher at Shizaki High School, has been fascinated with "demi-humans," beings with chara...

Machi Kyouko is a dullahan, a demi-human with roots in Irish legend whose head and body are separate, and one of only...

Succubi are demi-humans that arouse sexual desire in men and cause them to have obscene dreams. One such succubus, Sa...

Kusakabe Yuki overhears some girls saying mean things about her. Gossip is not an uncommon problem among high school ...

Yuki has become a bit more optimistic, thanks to Hikari and Machi. She's learned to trust Tetsuo a bit more since wha...

Keeping his promise to Himari, Tetsuo visits the Takanashi household to talk to the sisters' parents. Though the twin...

As she's walking through the school building, Sakie spots a beautiful blond-haired boy sitting on the floor, crying a...

The midterm exam score rankings are posted. While Himari and Kyouko earned high ranks, Hikari is scolded by Tetsuo fo...

Sakie the succubus is spending her evening at home alone, ranting her troubles to her teddy bear, when she receives a...

Dullahans are demi-humans whose heads are separate from their bodies. Naturally, Tetsuo is intrigued by the unique tr...

Tetsuo has offered to work with the girls to figure out how Hikari and Yuki, who don't handle heat or sunlight well, ...

Summer is finally here! Hikari pays another visit to the biology prep room to cool down, and while she's there, she a...