Alternative names:
Boku no Imouto wa "Osaka Okan"; Boku no Imouto wa "Osaka Okan"; Boku no Imouto wa "Oosaka Okan"; 僕の妹は「大阪おかん」
Kyousuke’s younger sister Namika has been living apart from him for ten years. One day, she returns and begins to live with him again, but she has turned into an energetic Osaka girl.