Mayuka was raised strictly as a proper young lady. Yet deep within her heart, an uncontrollable curiosity began to stir. One day, by chance, she discovered a BDSM photo book that dramatically changed her world. Captivated by its seductive and alluring imagery, she gradually became obsessed with this new realm. She started spending her days binding herself with rope, tightly tying her body while indulging in masturbation. Her desires grew stronger each day, and she secretly longed for Tsuna, her senior, to tie her up. Eventually, unable to suppress her feelings any longer, Mayuka resolved to hand Tsuna the rope. In that moment, a new relationship began to unfold.