is the general name for a series of Japanese light novels written by Japanese novelist Nisio Isin and illustrated by Taiwanese illustrator Vofan. Kodansha has published 20 novels since November 2006 under their Kodansha Box imprint, with at least two more novels planned. The story centers on Koyomi Araragi, a third-year high school student who survived a vampire attack, and finds himself helping some girls involved with all kinds of apparitions, deities, ghosts, mythological beasts, and spirits.