If you're reading the manga, (covering chapters 122–131) takes us into the legendary U-20 Arc .
Across both mediums, "15" represents the moment where "playing safe" dies. Blue Lock, Volume 15 - Boston Public Library - OverDrive BLUELOCK 15
This volume focuses heavily on Ryusei Shidou, the erratic, violent, but undeniably gifted striker. His "explosive" chemistry with Itoshi Sae begins to take shape here, setting the stage for the most intense match in Japanese football history. If you're reading the manga, (covering chapters 122–131)