Boku no Imouto wa Osaka Okan 5.80
Other Name: Boku no Imouto wa "Oosaka Okan", 僕の妹は「大阪おかん」
Summary: Kyousuke has been living apart from his younger sister Namika for ten years. One day, he begins to live with her, but she has turned into an energetic tsundere Osaka girl.