Boku no Imouto wa "Osaka Okan"

僕の妹は「大阪おかん」

Kyousuke Ishihara is an average high school student residing in Tokyo. Recently, his younger sister, Namika, has moved back home after living in Osaka for 10 years. As Kyousuke tries to understand his sister's peculiar behavior and dialect, the two bond over their differences and the difficulties that come with change. [Written by MAL Rewrite]