Episode 19: Dancing Boy

Debating their fourth member, Baro favors Kunigami's ball retention and Nagi prefers Mikage's balance, but Isagi argues that a safe, balanced pick would smother their potential. Since chemical reactions are the key to the Second Selection, he wants a player who can devour all of them, and only Chigiri matched their intensity without vanishing. Isagi recruits Chigiri for his legs, and Chigiri warns Kunigami he has not beaten Isagi yet and will be waiting.

Nagi bluntly tells Mikage he is done with him, dismissing their old promise to reach the top together, and Isagi urges Mikage to become the one who chooses rather than the one chosen, insisting only those with the potential to be the best survive Blue Lock. Elsewhere, Isagi's new squad settles into the Fourth Stage break room, where Baro nags Nagi and Chigiri to clean up while the two make the room messier studying ball-control videos, one of them featuring world number one Noel Noa.

Over a meal, Baro quizzes Isagi about his vision and vows to devour his talent, and Isagi promises to evolve even faster, both feeding a friendly rivalry.

Bachira trains against Itoshi, who easily stops his feel-based dribbling and cuts to the truth: Bachira looks joyful but is actually afraid to fight alone, forever hunting a partner who shares his football. A long flashback reveals Bachira as a lonely child branded a weirdo, comforted by his mother and by an imaginary "monster" he played football with, always believing someone out there felt the same joy.

Bachira recalls that passing to Isagi during the tag game was really a pass to the monster's spot, which made him believe Isagi could understand his football. Itoshi dismisses this childish obsession as the source of his half-baked play, telling him to keep playing with his monster while Itoshi conquers the world. As Bachira wonders whether Itoshi is a different kind of monster, Isagi waits outside the training room and tells Bachira he has come to keep his promise and bring him back.

The episode is part of the Second Selection Arc, using Judgement and Numbness like a ginger as its themes. The Additional Time skit, "The Team of Late Starters," has Imamura, Kuon, and Iemon band together despite Kuon's traitor reputation; Iemon delights at playing outfield instead of keeper, until Imamura's teasing joke about the goal makes him faint and delays their start further.