A man tails a schoolgirl riding a bicycle and, when he finds an opportunity, rubs an aphrodisiac on the saddle. Unaware of this, he straddles the bicycle and, when he starts to pedal again, the schoolgirl becomes horny from the aphrodisiac that has soaked into her pussy... He can't hold back and masturbates on the saddle! Still not satisfied, the schoolgirl instinctively feels pleasure even when she is attacked! Furthermore, there are many mishaps, such as "in front of her friends!", "near her boyfriend!", "on an upside-down bicycle!", etc.!