Majimoji Rurumo

Shibaki is a high-school boy whose only interest is girls. Except he's been branded as the most hentai boy at school and the girls avoid him like the plague. One day he finds a book in the library about how to summon witches. He tries it as a joke, but it turns out to be the real thing. An apprentice witch named Rurumo appears to grant him a wish....