Entertainment Blue Box Manga Hits 10 Million Copies in Circulation by Lila Roberts - Entertainment Editor May 3, 2026 by Lila Roberts - Entertainment Editor May 3, 2026 Blue Box Manga Surpasses 10 Million Copies in Circulation as Romance Hit Gains Momentum Kouji Miura’s Blue Box (Ao no Hako) has officially entered a new tier of commercial success, … 0 FacebookTwitterPinterestEmail