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Boku no Imōto wa "Ōsaka Okan (僕の妹は「大阪おかん」, My Little Sister's an "Osaka Momma"), is a 2012-2013 Japanese anime television series. Considered to be a "Short" style Anime series, due its episode lengths being only 3 minutes long.
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 tsundere Osaka girl.