Kagerota, a young ninja of the Kiryu family, has lived without feeling affection. His father Kenzan is a legendary red-nosed ninja. Kagerota parted from Kenzan at the age of 10 and loses all contact with his father. One day, Kagerota goes to the city of Edo with his fellow ninja for a mission. It is an easy task of stealing a special golden fish from a Daimyo Yashiki house. Kagerota sneaks into the house successfully. Just when he leaves with the fish, Kagerota feels a creature’s presence close by him. It is a red-nosed fat cat. The cat makes him nostalgic as it looks somewhat alike his father.