Chapter Summary: It centers around the travails and battles of Ushio Aotsuki who is constantly being stalked and aided by a gigantic, supernatural and sometimes invisible tiger-like monster (somewhat like Calvin and Hobbes). 500 years ago, his samurai ancestor battled that same tiger to a standstill, and eventually trapped him against a rock using a blessed spear called the "Beast Spear" that contains mystical powers. The series focuses on their relationship, interspersed with battles against mythological foes, and with Tora's attempts to grapple with modern life.