Marin Minami, a busty girl, visits Kameichi, a former actor known for his work in large-room productions. She expresses her desire to become an actress and asks to train under him. Using this training as an excuse, Kameichi repeatedly plays naughty pranks on her—groping her breasts, licking her arms, and escalating to deeper acts. Getting carried away, he progresses to deep kissing, saliva swapping, full-body washing in mixed baths, blowjobs, and sucking on her breasts. How far will Kameichi go as he becomes increasingly obsessed with Marin Minami?