Boring school life. Riho, a busty female student, uploads obscene erotic images to her secret SNS account in search of excitement. One day, her hobby is discovered by her homeroom teacher, whom she usually dislikes. "This is you, isn't it? This is a problem that can't be ignored... Shall we talk about it in detail in your room, including what will happen next?" he says, threatening her with the uploaded images... Her tears are in vain as her beautiful, pure body, along with her busty breasts, falls into the hands of a man.