Erina, a female student, often goes to help out at her father's construction company. In fact, she has another purpose. Contrary to her appearance, Erina "likes older men" and finds joy in following the workers with her eyes. One day, while in the construction company, Erina picks up a pair of work clothes and smells them. She then picks up an electric massager that catches her eye and indulges in masturbation. She is spotted by a worker returning home...