After getting into his first-choice university, adult student Kazuma stays with his aunt because her home is close to campus. He has admired her since childhood, and living in such close quarters keeps him constantly aroused. Unable to calm down, he masturbates to her underwear every day. When he sneaks into the changing room to steal a freshly worn pair, he runs straight into her. Kazuma apologizes desperately, but his aunt only smiles, takes the panties, and begins stroking him through them...