Hinata Matsuko loses her job at age 75 and decides to start a handyman business called "Last Boss Grandma." She answers requests from people in need, and while she sometimes shocks those around her with her unconventional behavior, she is also empathetic and sees people on an equal footing. Despite making mistakes and running around aimlessly, she throws herself into solving problems in a cute and heartwarming way. Matsuko herself also grows little by little as she comes to terms with the loneliness of old age and the meaning of life.