Yoichi Isagi is the central striker in Blue Lock, the football manga by Muneyuki Kaneshiro and Yusuke Nomura that began in 2018 and was adapted into an anime in 2022. The U-20 arc pits Blue Lock's ego-driven forwards against Japan's national under-20 side, a turning point that made Isagi's intensity iconic with fans. Clips of his scream spread across edits and soundboards alongside other anime ahh reactions, used whenever a creator wants instant, recognisable shonen pressure and release without needing dialogue or context to understand the emotion.