Tamaoki Benkyo manga
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 is a girl who is pleased only by BSDM. One day she meets Saeki, a normal guy, and they fall in love. Their love is normal but true, and maybe is the only way to forget all the bad and dangerous experiences of the past.
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 fall of 1966, tensions run high on the U.S. Air Force base in Japan on the eve of the Vietnam War. After a series of suspicious suicides in a nearby town, an additional threat has infiltrated the military compound - vampires. A covert team of government agents committed to the elimination of vampires dispatch a mysterious young woman named Saya who, in the guise of a schoolgirl, must uncover the origin of the demonic plague, eliminate the ghastly beasts and stop their reign of terror before time runs out. She is the last remaining original. taken from manga.com