The OVA picks up where the TV series left off: Nube still teaching, still hiding his demon hand, still the only thing standing between his students and the spirits that want them dead. Three episodes means no filler, just the high-leverage cases the TV run built toward. If you watched the series, you already know this man will break himself to protect kids who have no idea what he's actually fighting for, the OVA just gives you the sharp, concentrated version of that exact promise.

Nube returns to protect his students from forces beyond the veil. The kind, easygoing schoolteacher still keeps a monster hand under the glove on his left hand, and he can sense ghosts and evil spirits. His students remain at risk from demons, ghosts and a mysterious figure known as the Man in the wall. Nube is no longer fighting alone: the beautiful but somewhat daft Yukime and Tamamo-sensei, a yokai playboy who has become a doctor, join him to keep the children safe. The three-episode OVA picks up after the TV series and mixes supernatural action with comedy.