Ushio Aotsuki, a headstrong middle schooler and the son of a peculiar temple priest, dismisses his father's warnings about youkai, supernatural creatures. His mundane temple duties take a surprising turn when he stumbles upon a feared youkai, Tora, skewered by the mystical Beast Spear in the basement. Despite Tora's plea for freedom, Ushio remains skeptical and keeps him bounded. However, when a youkai crisis endangers his loved ones, Ushio reluctantly teams up with Tora, with the Beast Spear as a failsafe. This unlikely pair delves into the eerie spiritual realm, unveiling the perilous nature of the supernatural world. Armed with the ancient Beast Spear, Ushio embarks on a journey where the line between reality and fantasy blurs ominously.