While many seniors are re-employed after retirement, Sugiura, who works as an office cleaner at a young age, is rumored to have some kind of secret due to his intimidating appearance, and he doesn't even exchange greetings with the employees at his temporary workplace. However, Minami is the only one who treats him as an equal, and Sugiura is confused and doesn't know how to treat her. Then, important documents go missing, and the employees suspect that they may have been destroyed. "It can't be you, Sugiura!" Sugiura is gradually drawn to Minami, who believes in him for some reason, but...