Seishiro Nagi before he enters the titular Blue Lock facility.

Seishiro Nagi, a lazy high school sophomore whose catchphrase is "annoying," is discovered to have a talent for soccer by his classmate Reo Mikage, who dreams of winning the World Cup, and is invited to start playing soccer. After demonstrating his overwhelming soccer talent, Seishiro receives an invitation to the Blue Lock Project. There, he meets strikers from all over the country, including Kiyoyoichi, Hachiraku Mawaru, and Itoshi Rin.