Kikumaru's ordinary life — quiet days with his tanuki-faced sister and grandfather — shatters when a cat-eared woman in battle dress storms his grandfather's funeral vigil and opens fire. His sister transforms into a tanuki ninja. A mysterious protector named Touka reveals the truth: Kikumaru was born into the Saiga family, intermediaries between the hidden world of demi-humans and mainstream society. A new NEKO-NIN chapter begins.