Nagi Seishiro is a contender for the Blue Lock Project who currently plays as a rightwing for England's Manshine City in the Neo Egoist League. Nagi is 17, and very tall with a muscular build, although pretty light-weight. Nagi is very lazy and he prefers to do nothing all day rather than practicing, and he's often dragged to practice by his team mates, Reo and Chigiri. Nagi's best friend is Mikage Reo, and Nagi also has a close friendship with Chigiri Hyoma.