Introduction Arc

The first arc of the series spans the opening four chapters and the first two anime episodes. It establishes the premise of Blue Lock itself, introduces protagonist Yoichi Isagi, and sets in motion the survival competition that drives everything to follow. The stretch closes as the project's first competitive round is announced.

After the national side crashes out of the 2018 World Cup, a Japan Football Association meeting exposes a leadership content to treat the sport as a profitable brand. The outspoken newcomer Anri Teieri argues that this complacency guarantees Japan never lifts the trophy, and unveils her answer: a program to forge one revolutionary striker, fronted by the eccentric Jinpachi Ego. Meanwhile, high schooler Isagi loses a qualifier after passing to a teammate instead of shooting, watching rival Ryosuke Kira punish the moment. Haunted by the defeat and his idol Noel Noa, Isagi soon receives an invitation to a mysterious player-improvement project.

At the facility Ego lays out his creed to the assembled 300 under-18 forwards: football rewards the striker who scores at any cost, and Japan's failure stems from a lack of egoism. He warns that every player who loses will be barred from the national team for life, while the sole survivor will become the world's finest striker. Kira objects and others waver, yet Ego's challenge stirs Isagi to step through the gate, and the crowd follows. Sorted into shared quarters, Isagi is tagged number 299 and placed in Team Z, where he meets Gurimu Igarashi and the rest. Ego then reveals a ranking system in which only the top five reach Japan's U-20 squad, and stages a game of tag lasting 136 seconds, the runtime of a player's average ball possession. Through a chain of desperate choices, Isagi ends up striking Kira as the final target, and Kira is expelled, his protests dismissed as Ego praises the raw selfishness Isagi and Bachira showed. Elsewhere, the gifted expatriate Sae Itoshi, dismissive of Japanese football, grows curious about the experiment.

The entrance test leaves eleven players, Isagi among them, forming the facility's lowest-ranked group, Team Z, while Kira walks out believing the whole scheme is madness. Intrigued by what Blue Lock might produce, Sae Itoshi cancels his flight back to Spain to watch from within Japan. Ego then unveils the First Selection, a round-robin among the fifth stratum's five teams, forcing Team Z to cooperate for the first time and setting the stage for the competition to come.