Shouzou and Ine Saitou have shared a lifetime of love and happiness, even as they've grown old together. Their enduring bond is evident in their wrinkled faces and creaking limbs. But one day, out of the blue, they wake up to discover that they're young again!
Although they now possess youthful and attractive bodies, Shouzou and Ine remain unchanged at heart. The story chronicles the adventures of this young-old couple as they navigate their daily routines, cherish moments with family, and challenge the stereotypes of youth.