Mine, an ordinary, unassuming office lady, is shy and has no boyfriend, spending her days yearning to be touched by a man. One day, on the commuter train, she encounters obscene fingering. She doesn't feel disgusted, and as her clitoris and vagina are Ke'ai with fingers, she climaxes with joy, squirting juices while trying to suppress her voice. Even after arriving at the office, her heart is still pounding and she masturbates to the afterglow. "Maybe he'll touch me again..." she thinks, so she gets on the same train at the same time again, and this time, he even inserts a penis into her...