Naota is a normal Japanese 6th grade boy, but when his older brother leaves for America to play baseball, his brother leaves his homeless 17-year-old girlfriend Mamimi behind. Mamimi is sending mixed signals and advances to Naota, and he doesn't know what to do about her. But to make matters worse, Naota's world is totally turned upside down when he is run over by a woman on a Vespa. She calls herself "Haruko" and her presence changes Naota's life to even further insanity.

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