It was announced by "BLUE LOCK" that its cumulative worldwide circulation has surpassed 60 million copies in conjunction with "BLUE LOCK Day" on June 9, 2026. Due to the Japanese wordplay where the numbers 26, 6, and 9 can be read as "BLUE LOCK" (26 for Bu-ru, 6 for ro, 9 for ku), this day is considered the "once-in-a-century BLUE LOCK Day."