Ookami-kun wa Kowakunai

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

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