Her grandfather is a politician, and her father is a real estate owner. Ninomiya Sayuri is an arrogant young lady whose power and wealth peaked during the 90's bubble period. However, it all came down together with the collapse of the bubble. Now aged 46, she's a homeless person eking out a living.

One day, a group of delinquents attacked her while eating scraps at a public park and knocked her unconscious. Just when Sayuri thought she had died while clinging to her past happiness, she somehow time leaped almost 30 years before to the days of her high school period…!? To save her family from the tragic future that awaits them and gaining hold of true happiness by not relying on money, she comes up with a "Silver Plan" by putting all her effort to make friends, save money, be healthy and more.