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 gentle schoolteacher still hides a monstrous truth beneath his left glove, a cursed hand that grants him power over the supernatural threats that plague ordinary humans. What began as isolated encounters with vengeful spirits and malevolent entities continues to escalate, drawing Nube deeper into a conflict between the living world and the realm of the dead. As his students unwittingly attract paranormal attention, Nube must balance his role as an ordinary educator with his secret duty as a spiritual guardian. Each case tests whether his monster hand's raw strength alone can solve problems rooted in human tragedy and unfinished business. The stakes grow heavier as he discovers that some supernatural threats refuse simple solutions, demanding not just combat prowess but understanding and compassion. This continuation balances action and character moments, blending horror with humor as Nube cracks jokes while facing demons. Viewers return to watch a genuinely kind man grapple with an increasingly dangerous burden, all while keeping up appearances in a normal classroom.