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Anime+ RedCircle

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Sakamoto Days has reached 3.500.000 copies in circulation with 13 volumes. : r/SakamotoDays

Weekly Shōnen Magazine, Wiki Ippo

Hajime no Ippo Boxing Manga Exceeds 100 Million Copies in Circulation - News - Anime News Network

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Mag Talk - Weekly Shonen Magazine - News and Discussion, Page 32

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Sakamoto Days has reached 3.500.000 copies in circulation with 13 volumes. : r/SakamotoDays