HappyFunGame

One Piece just released 3 volumes for this years. JJK was 4 volumes this year. That might be why JJK got the first spot this year. Even then One Piece volume 108 is highest-selling manga volume of 2024 which is above JJK. You can check it out the top 10 best selling manga volumes of 2024. One Piece got 1, 3, 6 spots and JJK got 2, 4, 5, 8 spots. If u just google u might see some weird list but the reliable source is from Oricon, the authority for sales data in Japan.