Manga Introduction

Ushio to Tora (Ushio and Tora) is Kazuhiro Fujita's work before Karakuri Circus. It ran in Shonen Sunday, one of the largest weekly manga magazines in Japan from 1990 to 1996. There are 33 volumes, plus one side story volume making a total of 34 volumes in total.

It centers around the travails and battles of one Ushio Aotsuki (蒼月潮 Aotsuki Ushio), who is constantly being stalked and aided by a gigantic, supernatural and sometimes invisible tiger (Some people describe it as akin to Calvin and Hobbes on acid, but I disagree).

Ushio's family maintains a Shinto temple in Japan, where ~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", which in addition to its intrinsic formidability as a weapon, can also boost the physical powers of the user. While cleaning out the temple storage, Ushio accidentally unseals the chamber Tora was trapped in. Initially, Ushio wisely refuses to remove the spear pinning Tora (とら, Japanese for tiger) down, as Tora unwisely makes the strategic blunder of mentioning that the first thing he would do upon being freed would be to devour Ushio; but Tora's unsealed presence attracts various demons to the premises, and Ushio is forced to free Tora in exchange for his help. The series focuses on their relationship, interspersed with battles against mythological foes, and with Tora's attempts to grapple with modern life and gobble up Ushio.

(Taken from Wikipedia, since I liked their plot synopsis way better. It has been modified to my liking.)

Without further ado, I present to you: Ushio to Tora.