Sayuri Ninomiya was an arrogant lady from a wealthy family during the bubble period. However, the bubble eventually burst and she is now a lonely middle-aged homeless person. One day, Sayuri came across a book "Silver Plan Recommendations" and learned that "there are only three important things in life". Later, a bad teenager threw a stone at Sayuri and she wakes up finding herself back as a high school student. Sayuri decides to take the opportunity and redo her high school life according to the Silver Plan.
