The volume quickly surged past its closest competition, extending a trend that’s defined much of 2026 for the franchise as it continues topping weekly and monthly sales charts across Japan. According to the results, ‘One Piece’ finished as the best-selling manga of the month with 1,437,565 total copies sold, cementing its position as the clear sales leader for the period. One Piece is the best-selling manga of July, with 1,437,565 copies sold ! further underscored just how broad manga’s monthly sales landscape remains, even with ‘One Piece’ and ‘Hunter x Hunter’ commanding the top two spots by a wide margin. What keeps One Piece at the top of manga sales charts?