A beautiful woman he sees on the commuter train. One day, Aizawa, a virgin, witnesses her secret rendezvous with a man and peeks at her lewd blowjob. She then has sex with another man and becomes even more lewd. Aizawa can no longer bear the sight of her being picked up, becoming a masochist and getting fucked over and over. He gathers up the courage to call out to her and experiences his first sex, which gently embraces his innocent Kokoro!