While spending the night in a traditional inn, the Medicine Seller stumbles upon a strange phenomenon. A pregnant woman named Shino who is desperately seeking shelter at the inn is led to the last vacant room. The room, though, is haunted by a group of Zashiki Warashi. When the Zashiki Warashi kill an assassin aiming for Shino's life, protecting Shino and her unborn child, the Medicine Seller inquires into the origin of the mononoke.