In a world where two types of beings exist—normal humans and beast-kin (with ears)—this is a story of the encounter between a highly capable director and a beautiful specialist doctor.
There are two kinds of people in this world, normal humans and beast genus (with ears). The beast genus has a special ecology in which same-sex pregnancies are possible and has a mating season. Akira Miyaji, adoctor who specializes in the beast genus, is himself a beast genus, but he lives resistingly, saying “Idon't want to be a beast genus that is driven by instinct“. Miyaji is strangely interfered by the director of the hospital, Kijima. Kijima has a rare dominant gene, and by his strong pheromone, his relationships with women was disordered. Miyaji is not fond of Kijima, who is completely the opposite of himself, but still confused by him. One day, he is hit by Kijima's pheromones, and goes into an irregular mating period...?