In a quiet residential apartment complex, the Nishio couple live an ordinary life. One day, Kaori happens to see her neighbor, Mr. Omachi, a well-endowed man, meticulously cleaning the entrance with unusual precision. He calls it "housework exercise"—a unique method of working out while doing daily chores. Intrigued, Kaori immediately asks him to teach her. At first, she takes the lessons seriously, but soon the atmosphere turns sensual. An unexpected relationship blossoms in the mundane, leading to the beginning of a new romance.