on her usual commute train, hiyori was confused. she had never experienced such pleasure from her boyfriend, a sensation welling up from deep within her body. she struggled to suppress the moans that threatened to escape. despite her dislike for sex, she couldn't help but wonder why she felt this way. the only answer was the relentless fingers of this middle-aged man, drawing out her ecstasy in a way she couldn't admit. through one middle-aged man, she discovered the forbidden pleasures of the flesh. the serious, reserved girl's feminine desires were awakened. seeking the depths of carnal pleasure, she transformed into a woman craving sex.