Shikkakumon no Saikyou Kenja series

The total print run of the Shikkakumon no Saikyou Kenja series: Sekai Saikyou no Kenja ga Sarani Tsuyoku Naru Tame ni Tensei Shimashita (Light Novel: 15 volumes and Manga Adaptation: 19 volumes + Initial print run of volume 20 publication>) is 6 million copies in print in Japan.