Yohko Mano has just turned sixteen, and the boy she's crazy about doesn't known she exists. Now, her loony grandmother has dropped a new bombshell. Yohko is the 107th generation of a family of professional devil hunters - and she's stuck with the job whether she likes it or not! Now, all of Japan's devils, demons, and blood-letting creatures of the night have decided to eliminate Miss Mano before she learns how to use her new powers! It's going to be a very un-sweet sixteenth as Yohko's birthday turns into a demonic bloodbath and a grueling trial by hellfire!