Koharu, a dedicated student who devotes her life to volleyball, spends her days immersed in the sport. Her body, toned through relentless training in receiving, setting, and spiking, radiates a voluptuous sexiness. Exuding an athletic charm, she also draws attention as a transistor goddess. While passionately striving to improve her beloved volleyball skills, her classmates grow busy with college prep, leaving Koharu practicing alone with her coach. Then, a strict new coach arrives. Driven by her desire to become stronger, Koharu throws herself into intense training—only to suddenly find her uniform stripped off and a hot, throbbing cock forced into her mouth. What does this lewd service have to do with volleyball? What is the coach's true intention?