Far beneath the old prestigious violin school, St. Cecilia Academy, lies an evil secret. A monstrous colon-slurping lives under-ground, granting power to the one who plays the violin, kannone, in exchange for copious amounts of its favorite meal. To fulfill his half of the bargain, the head-master begins an ambitious program to enlist only the most beautiful women into his special classes. Yukina is not about to lie down and take it - she has the holy violin of St. Cecilia and she's going to fight back.