An overworked salaryman and a mischievous cashier with a dual personality form an unexpected bond in this sweet-and-sour comedy! As the end of the year approaches, Yamada feels blindsided by a coworker's claim that Sasaki is a married man! Naturally, misunderstandings ensue. Later, on Christmas Eve, Sasaki has a chance encounter with a super-shy supermarket employee. And as the new year begins, Sasaki receives a message that shakes up the smoking buddies' relationship again...