In this world, there are two types of beings, normal humans and the beast genus (people with ears and tails) who have a special physiology, which allows homosexual pregnancy. Akira, a veterinary specialist with the beast genus, has lived against his existence, saying, "I don't want to be a beast that is swept away by my instincts." But after meeting Sougou, a beast genus who’s lived by his instincts, this changed. After many twists and turns, they have finally become a married couple. Their beloved son Shouta was born and they are happy with where they are in life, but Sougou's father doesn’t really think much of Akira, who doesn't look like a beast …?!!

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