Azure Night, Waltz of Rapture

When a night out to a piano recital turns into a literal nightmare for Seo-Yun, she's unceremoniously inducted into a world of horrifying beings. There, she meets Hui-Won, a charming "superbia" who informs her that she is nothing more than food for these creatures born of sin. Now, she must succumb to the likes of vampires and incubi as they feed...