From Viz:

The immortal Saya returns--a generation later, but still clad in her trademark sailor suit and armed with ancient samurai sword--continuing her holy war against the vampiric Chiropterans.

In the urban city of Tokyo, there exists a defiled world full of lecherous fiends. Living amongst them is Akazukin (Red Riding Hood), a little girl with a strange persona and an even stranger desire: to be eaten by Mr. Wolf.

WARNING: This manga is suitable for an adult audience due to its sexually and gory explict theme.

Okuno Ryouko and Saeki are quiet normal students. But only at the surface. At university, they both feel out of place; so, Okuno visits a S&M club after classes. Saeki happens to visit this club as well; rather than participating in the activities like Okuno, he is there to play music. When they both meet there, they seem somewhat attracted to each other. But will this attraction last, when they come to know about each other better? Will love be able to bloom?
(Source: Imangascans)