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is a sports manga by Mitsuru Adachi which was serialized in the manga magazine Shonen Sunday from 2001 to 2005 .. Mitsuru Adachi. Mitsuru Adachi. Shonen. Shonen manga. manga. manga. manga magazine. List of manga magazines. Shonen Sunday. Shonen Sunday. It centers on a freshman student , Katsuki Satoyama , as he discovers his near-legendary skill in boxing .. boxing. boxing