Sasaki, an overworked salaryman, finds a release of his daily tensions in the customer service of Yamada, a winsome, cheery supermarket cashier. One day he finds himself working late, and finding Yamada already done with work for the day, goes for a smoke, he finds a mysterious woman, "Tayama", who invites him to the smoking area behind the store. Yamada has a one-sided crush on Sasaki, and enjoys teasing him, though Sasaki remains completely oblivious of her feelings and of "Tayama" being her secret alter ego.