Office worker Yoshiko is harassed on the train to work. By chance, she finds a wallet there, and is invited to dinner by its owner, Sagawa, as a thank you. Completely drunk, Yoshiko ends up in bed with Sagawa. The next day, she is harassed again, and in her agony, she steals the wallet that is right in front of her. Afterwards, Yoshiko gets into trouble with the owner, Ota, again. Yoshiko has gotten used to this outlet for her frustrations, but the next morning, she gets a call from a woman in her room...