Beastmen, who resemble humans and have a cute appearance, are becoming popular as life partners. The beast girl Mel, who has been waiting for her "master" to visit her one day, begins to cultivate a modest yet certain happiness alongside the beautiful and lonely mistress in the mansion she was taken to. A deep affection is born between the protector and the protected. This gentle innocent world, woven by a master-servant relationship that teeters on the edge, begins its story.