Yasuko, a housewife, lives in an urban high-rise apartment with her husband Satoru and her son Takuto. Annoyed by spam calls and door-to-door salesmen, Yasuko slams the door on a salesman’s hand when he tries to squeeze a flyer through the apartment's chained front door. He leaves, but the next day, her nightmare starts.
Every year on the fourth of January, Shobei's soba restaurant serves "Sanada Soba"; soba noodles topped with grated spicy daikon radish. Even regulars refrain from coming to the restaurant because of the extra spicy soba. But on year, a stranger comes in and finishes the bowl, announcing that it tastes familiar. The man begins to visit every year on the 4th of January to eat Sanada Soba. Shobei develops a warm feeling towards the peculiar customer he interacts with once a year.
