The 23rd volume of the Kimetsu no Yaiba manga has already sold a total of 2.885 million copies, becoming the manga with the highest number of sales within a one-week period.
Additionally, it's worth noting that the series reached 102.892 million copies sold on December 6th. It's now the second manga series in Oricon's charts to sell over 100 million copies. The first series to achieve this feat was One Piece in 2012.
Kimetsu no Yaiba Gaiden volume , which went on sale on the same day as the final volume of the manga, sold 859,000 copies and reached second place in sales.
The limited edition of the final volume of the manga, which came with a free figurine, sold 576,000 copies and managed to reach 3rd place in sales, meaning that the series dominated the top three weekly sales charts.
Source: ANN