Yoki, Koto, Kiku.

The Nekogami family operates under a deadly system of sibling rivalry. After the patriarch's death, his grandson Sukekiyo is named heir, but he is missing due to being away at war. The family fortune can only go to one heir, and the triplets Yoki, Koto, and Kiku oppose Sukekiyo's fiancée, Tamayo, claiming the inheritance. Facing threats from demons and thieves, the triplets compete for the inheritance, resorting to violence against each other and external dangers to secure the family's wealth.