On his way home from a night of drinking after being dumped by his crush, Yoshida, a 26-year-old office worker, meets a high school girl named Sayu sitting on the street. Drunk as a skunk, he stays the night with Sayu. The next morning, he wakes up to a delicious aroma of miso soup on the dining table. He can't kick out Sayu, who has run away from home and has nowhere else to go, so he decides to allow her to live with him on the condition that she does some housework. In this way, a strange communal life between a runaway high school girl and a businessman begins.