Student Atsushi instantly fell in love with married woman Maki 's smile as she offered her seat to an elderly person on a crowded train. Without knowing her name or address, Atsushi followed her and found out her name, address and family background. As he began to act like a stalker, Maki 'Maki skin exploded, and he created an extremely powerful aphrodisiac. Then, on the crowded train, he slowly inserted his fingertips covered in the aphrodisiac into Maki's vagina...