What happens when a timer-programmed vibrator is fixed onto a girl's sensitive spot, delivering continuous vibrations at intervals starting from one to two minutes, gradually increasing the duration? Five minutes, six minutes... ten minutes... As time passes, the sensation grows stronger and stronger, eventually turning into an unbearable threat. G-cup seductive and naughty beauty Koyuki, Yui known for her pelvic dancing, and the translucent, pure-looking Hiro experience SM-like stimulation for the first time in their lives. Their reactions are captured in vivid detail.