Married for seven years, no children. Nao's sexual desire grows stronger with age. Her husband is busy with work and barely pays her any attention, so she comforts her aching body by herself every day. Unable to contain her desire for sex, Nao seduces a delivery man. She also seduces the student next door, devouring his young body. Having discovered the pleasure of another man's cock, Nao's sexual desire escalates...