Kiyoka Igarashi uploads exercise videos that have become extremely popular, but in her personal life, she suffers from a sexless marriage with her husband. One day, she gets an opportunity to provide in-home fitness training, and during the lessons, she can no longer suppress her pent-up desire. Drenched in sweat, the erotic image of this married woman emerges as she directs her lust toward her young students. These secret training sessions continue without her husband's knowledge.