A samurai Tsubaki has just arrived in Edo from the hometown to find a position as an official. While searching for the owner of Nyanmage, a stray cat happened to meet, Tsubaki reunites with a ronin (masterless samurai) named Yasubei from the same town.
When they stop by a nearby teashop, the old shopkeeper tells them an interesting story. Just recently, an unprecedented decree was issued that whoever catches a big cat with a topknot will become a vassal of the Tokugawa Shogun's family. The cat's features are exactly like Nyanmage itself.

A golden opportunity for success comes to samurais unsure of their future path!
What’s the identity of Nyanmage and the truth behind the strange decree?!