It is the year of the Holly era. The species known as mankind has greatly diminished in number, and goblins and monsters have once again claimed their place in the world. Learning to coexist, the different species have mixed together, and this partnership has given birth to the half man, half monster breed that now accounts for the majority of the world's population.
Natsuki, a mixture of half human and half demon cat, is a bounty hunter who has strong specter power. Her partner, Sakura is a mixture of half human and half demon fox with 9 tails. Since Sakura is a half-demon, she plots to take over Natsuki's power to become a complete demon. But as the day goes by, they are bound by strange ties of friendship, and start to catch vicious criminals with exquisite combination.