Reincarnated in Hidden Leaf as a ninja cat, the protagonist makes a living selling ninja tools. One day, a red-eyed individual arrives, changing everything. Forced to become a summoning beast for Sasuke, the protagonist sacrifices their freedom, empowering Sasuke for revenge. This story is also known as "Ninja Cat's Unexpected Life as a Summoning Beast" and "Impersonating Sasuke's Second Uncle After Being Sealed."