Grandpa and Grandma Turn Young Again

Premise

Shouzou and Ine Saitou have been happily married for as long as they can remember. Even in their old age with wrinkles and cracking limbs, the strength of this love is evident in their precious bond. And then, one day, they wake up to find they are young again! Despite their newfound youthful and attractive bodies, Shouzou and Ine remain the same as ever.