It's said that the people in this world have evolved from their cat ancestors.Both males and females can give birth.Grim Manabe's a minor radio personality.He reluctantly accepts an invitation from his roommate to go out for drinks one night, where they're joined by a veritable litter of up-and-coming stars.One of which, Masachika, turns out to be a fan of Grim's radio show and voice. Grim's apprehensive at first, but Masachika knows how to keep a comfortable distance.The two gradually become closer and closer.One night, Grim passes out while drinking alone with Masachika.He wakes up to find himself shockingly in bed with the young man!