Saito, who was drawn into another world, has been looking for a way to return to his original world. Finally one day, he encountered a once-in-a-millennium opportunity to return to Japan, but in order to save his master Louise who was in crisis, Saito decisively gave up this opportunity and stayed, and finally chose to live as a flat-chested familiar. Louise recognized Saito as her own familiar! ? Although he lived a life of being a dog and being served by a whip, Saito still accepted Louise's training and quietly enjoyed the sound of the whip. Once you touch the taboo of your master Louise, you will be severely punished. Will such a peaceful life continue forever...