At 24 years old, Nana is an uninterested young adult living a pedestrian life. However, after enduring a car accident, she wakes up in her 14-year-old body, back in middle school. As she navigates through her daily routine, long-lost memories gradually resurface. Suddenly, she remembers looking up to her older sister with immense admiration. Nonetheless, she remains unaware of her past involvement with her sister's high school sweetheart.