A Story About a Grandpa and Grandma Who Returned Back to Their Youth S01E04 - Grandpa and Grandma and the Culture Festival
Summary:
At Mino's invitation, Shouzou and Ine decide to go to the culture festival at her school. Once there, an accident causes Ine to have to change clothes. When she puts on a sailor-style school uniform, she reverts to mannerisms she used in her school days.
A Story About a Grandpa and Grandma Who Returned Back to Their Youth S1E4 Screenshot