Modern Vampire Slayers is a Manga/Manhwa/Manhua in english language, Manhwa series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

Only the Slayer can save the world. Long ago, vampires were created by the devil as destroyers of humanity. Now a vampire is after something but can disguise itself like anyone. What happens when an experienced and blood-crazed vampire gets loose in the city and no one is there to stop it?