"Do people fall in love with someone on their first heat...?"

The world is filled with animals that can evolve into beast men. There is a young and earnest wolf who was always mistaken for a showy person because of his flashy looks. The easily mistaken wolf has fallen for an attractive looking rabbit named Usami, whose skin is tanned. Even though Usami is very cautious of the carnivores, he would put his guard down only when he is with the easily mistaken wolf, who was a pervert that became a life saver for Usami. But what will happen to Usami on his first heat!?

(Source: Kadokawa, translated)

For generations, the Kagurazaka family have possessed the power to speak with the messengers of Inari, a power that has been sustained through the centuries by intermarriage with women of the Ujou family. Having waited long for his bride, Rio, the current heir to this power, is shocked to find himself abandoned by his bride-to-be when she elopes with another man. Shortly after, her younger brother Nagi presents himself to the shrine as her replacement, declaring "As a man, I can't produce offspring, but I can have sex."(Source: Hero Scans)