Onna no Ana

Onna no Ana (literally, Girl's Hole) is a collection of short stories about boys and girls linked by strange connections at a certain school. 1. Onna no Ana, (Girl's Hole) 2. Onna no Atama, (Girl's Head) 3. Onna no Buta, (Girl's Pig) 4. Onna no Oni, (Girl's Beast) (Source: Anime News Network)