The Beast Clan that protects the mountain only consists of males. Therefore, it is customary for the village at the foot of the mountain to send a daughter to them when they reach adulthood. A village with small harvest cannot survive without the blessings of the mountain. Giving birth to a Beast Clan child brings prosperity to the village... this is the village rule that has been passed down since ancient times. Even though she knows it is a tradition, the protagonist, Rin, feels fear at being sacrificed to the beasts. Moreover, this time she will become the mate of the king of the Beast Clan, so her responsibility is heavy. Determined to do so for the prosperity of the village, she heads to the palace deep in the mountains, where she finds the beautiful Beast King, Aus, on the throne at the back of the great hall... Aus treats the terrified Rin with kindness and gentleness. Starting with a passionate kiss that takes her breath away, Rin melts as her nipples are teased, her clitoris is sucked, and her vagina is stirred up. A relentless baby-making sex begins...