Oricon Top 50 Singles for the first half of the 2021 survey period (December 15, 2020 - June 14, 2021). Results were taken from Oricon site (as originally published) and do not include sales from most recent upload. All media used belong to their respective owners, I do not own any content.
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Intro Trivia: "Everyday, Katyusha" was AKB48's first single to sell over 1 million copies in its debut week. The single also broke the Oricon record for largest debut-week sales (1.333 million), which was previously held by Mr.Children's 1996 single "Namonaki Uta" (1.208 million).
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EDIT: Additional songs may have been muted (without warning) due to copyright claims that were posted after the upload date.