Grandpa and Grandma Turn Young Again

Grandpa and Grandma on Their Honeymoon: Atami Arc (1x7)

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Shouzou, Ine, and the others arrive at a lovely inn in Atami. After some sightseeing and delicious food, it's time for bed. The plan was for the men and women to sleep in separate rooms, but Mino wants Shouzou and Ine to have time alone together.