Famitsu Sales: Week 1, 2021 (Dec 28 - Jan 03)

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Regardless of whether it's counted at 52 or 53 weeks, the fact remains there are 5 days of 2020 after the week ending December 26th, and if the total after 7 of those days was 6.26 million, then it's safe to say it passed 6 million by January 1st.