One day, an ordinary girl is invited to a man's apartment after meeting him through an app, and her sexual experience there becomes an outlet for his desires. He restrains her and aggressively takes her while she's defenseless, forcing her to simultaneously experience pleasure and fear. Her first time occurs through forceful, greedy sex—her body trembles, she loses consciousness, and still receives a thick creampie. Used like a toy, her cervix is repeatedly pounded in various positions, and through this relentless stimulation, she gradually transforms into a submissive female beast. This entire experience becomes the most shocking event of her life.