Nozawa Toyo is over 60 years old, yet remains physically and mentally vibrant, actively managing household duties and enjoying sports as a hobby. Since her husband passed away at a young age, her sexual desires have never faded, and she indulges in masturbation almost daily. One day, her college-aged grandson loses a judo match and becomes deeply discouraged. To cheer him up, she offers her usual cheerful support and encouragement, but her own emotions gradually become entangled in the process.