The Familiar of Zero: Knight of the Double Moon

Saito, who was dragged into another world, has been searching for a way to return to his original world. Finally, one day, he encounters a once-in-a-thousand-years opportunity to return to Japan. However, Saito decisively abandons this chance and stays behind in order to save his master Louise from a crisis, ultimately choosing to continue living as her familiar. Louise acknowledges Saito as her personal familiar!? Although he lives a life where he is treated like a dog and whipped, Saito remains submissive to Louise's training, quietly enjoying the swishing sound of the whip. If he touches upon any of Master Louise's forbidden areas, he will face severe punishment. Will these peaceful days continue forever...