With over 82,000,000 collected volumes sold, Demon Slayer has had the best selling year ever for a series, decimating One Piece’s 2011 yearly sales record of 37,996,373 copies sold.
Demon Slayer: Kimetsu no Yaiba also pulled off the feat of being the most sold book in Japan over the last year, with Demon Slayer: Flower of Happiness selling 923,139 copies being the first series ever in Oricon history to hold the manga and book top spots.
All in all, 2020 was the year of Demon Slayer: Kimetsu no Yaiba.