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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, Atsushi's desire to touch Maki's 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...