Across both mediums, "15" represents the moment where "playing safe" dies. Blue Lock, Volume 15 - Boston Public Library - OverDrive

If you're reading the manga, (covering chapters 122–131) takes us into the legendary U-20 Arc .

In this episode, titled "Devour," the Second Selection reaches a fever pitch.

The episode ends with the high-stakes choice of who to take for the next stage, a decision that shifts the entire dynamic of Isagi's team. Manga Volume 15: The Monster Ryusei Shidou

Volume 15 is where the Blue Lock project moves from an internal experiment to a national spectacle. The tension is no longer just about staying in the program; it's about the very survival of Blue Lock against the established U-20 Japan team. Why "15" Matters

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.

We see Isagi realize that he and Naruhaya are effectively "the same"—average players struggling to survive among monsters. To win, he doesn't just improve; he devours Naruhaya's off-the-ball movements to score a legendary goal.

Blue Lock 15: The Peak of Egos and Evolution Whether you’re catching up on the high-stakes anime or diving into the visceral manga, marks a pivotal turning point in the Blue Lock saga. Between Episode 15 of the anime and Volume 15 of the manga, we witness the absolute transformation of Isagi Yoichi and the emergence of some of the series' most terrifying talents. Anime Episode 15: " Devour "