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A 21st century high school graduate accidentally traveled back in time to a little girl who was a beggar in ancient times. The little girl wore a stone-like necklace around her neck, which actually contained a 21st century library and a 21st century medical device. The female protagonist accidentally saved the injured male protagonist during an outing. After accidentally having a relationship with him, she was pestered by the male protagonist with a paranoid personality. In the end, the male protagonist obtained the female protagonist's body and successfully married the female protagonist. However, the male protagonist's paranoia and strong desire to control made the female protagonist feel suffocated and resentful.