SOD female employee, second-year PR department member Akari Matsunaga, has reached her one-year debut anniversary. She was given a special training period to become a SODSTAR. While bewildered by the pressure of the flagship label, she resolves to take on the harsh challenge of an all-out gangbang. As the overwhelming numbers of nearly 40 ejaculations, 23 creampies, and 11 facial cumshots show, a 20-man all-out training session unfolds. Through this training, Akari Matsunaga grows from a mere office lady into an exclusive actress, raising the signal fire as a SODSTAR.