After graduating from high school and becoming an adult, Yui works diligently at a local warehouse until she makes a serious mistake. She is called in to speak with the company president's son and expected successor, whose persistent sexual harassment has already troubled her for some time. He offers to overlook the mistake if she gives him her body. Unable to resist the coercion, Yui submits, and the future boss begins demanding her hidden G-cup body almost every day. As the secret orders continue, she discovers a submissive side she never knew she had.