Shouzou Saitou and his wife, Ine, have been married for nearly sixty years. Though they have not become wealthy or been able to go on a honeymoon in all that time, their love has remained steadfast. The couple spend their days peacefully tending to an orchard of apple trees and receiving visits from their loving family. While tending to the apple tree they planted on their wedding day, which had snapped in half during a typhoon, the couple notices a golden apple hanging from one of the branches. They decide to eat the apple back at home, and the next morning, the couple awakens to find that they have become young again! In their new but familiar bodies, Shouzou and Ine are able to live life as they never had before: they engage in more modern activities together, such as participating in a sports festival and playing video games. As they revisit the memories of their young love, the romance between them is rekindled, inspiring similar feelings in the younger members of their family.

Meet Kaito Takagi, your typical high schooler with a low profile. He spends his days exploring dungeons in Japan, hunting slimes for some extra cash. On the side, he quietly admires his childhood friend, the popular girl in class. One day, a rare golden slime shows up, and after Kaito defeats it, he finds a super valuable item—a card that can summon mythical beings! He decides to use it and summons a stunning warrior maiden. Now, Kaito has a chance to rise above his ordinary explorer life. Get ready for a modern fantasy story filled with battles! (Source: MAL News)