Amongst the dozens of characters who comprise Usagi's cast, there's one who stands out as being a little more familiar to readers of comic books than most; his name is Sasuke and his singular occupation is that of demon queller.
The first significant thing we learn about Sasuke comes when he calls Usagi by name, despite Usagi not having given it. "You must have introduced yourself when you came over," is Sasuke's simple response; Usagi might accept this, but we readers have the advantage of looking back over the previous panels, where we can see Usagi did no such thing. Something is off about Sasuke's explanation, but it's not because he's heard of Usagi by reputation or has been secretly observing our hero from afar; Sasuke knowing Usagi's name is just one of his supernatural talents.
The supernatural has figured in Usagi Yojimbo comic books almost from the first story, almost alwaysto bedevil Usagi. In "Kumo," Sasuke is an ally - and quite a powerful one!
There you go: Usagi Yojimbo is not just a funny animal book with a period setting, it's also a raucous fantasy adventure! Is that helpful? Please consider picking up a Usagi Yojimbo story - don't dismiss such a fine series sight unseen!