Yoki, Koto, Kiku

Yoki, Koto, Kiku summary:

From Broccoli: In the ancient House of Nekogami, sibling rivalry is a game of life and death. The patriarch of the Nekogami family is dead, and his grandson Sukekiyo is the rightful heir. There is just one problem--Sukekiyo is away at war, whereabouts unknown. Only one person can inherit the fortune, and the triplets, Yoki, Koto, and Kiku, aren't going to let Sukekiyo's fiancee, Tamayo, walk off with prize. With a fortune at stake, it's kill or be killed as the Nekogami family goes up against demons, thieves, and each other to protect the family... and the cash!