The main character of this story, Kikumaru Saiga, learns of his destiny due to his grandfather's death, and a lot of things happen almost immediately after. Specifically, what happened was...

(1) In this country, there are beings with different roots from humans, called "Demi-Humans," existing secretly. (2) The Saiga family, the protagonist's lineage, has been the existence that connects this "underworld" with human society. (3) The protagonist, actually an illegitimate child of the Saiga head, Magoichi, gets caught up in a succession battle in the absence of a leader. (4) Under the loving guidance of the cat ninja, Fujika, he somehow succeeds in awakening his bloodline. (5) He defeats a long-time bad acquaintance (a thug) who attacked him, and somehow gains a moment of peace.

As you can gather from the content, the situation is far from resolved.

With the strongest cat ninja, Fujika, and the former assassin, Chika, as companions, Kikumaru, who is unsure whether to rebuild the Saiga clan, is confronted by, what, what?! A tanuki, a fox, his own older sister... And even cat ninjas of the Fuma clan who were doing various things in the past somewhere far away under the sky? Furthermore... and so on, leading to a path of chaos, the final chapter of the modern cat ninja action drama.

With no holding back on cuteness, I'll meow meow all over you.