The sound comes from Kamen Rider Blade, the 2004 tokusatsu series where Sakuya Tachibana transforms into Kamen Rider Garren. Tachibana's intense fear and frequent shouting made his scenes a long-running joke among Japanese fans, who clipped his most panicked moments for niconico and later social media edits. As the clip spread, it became a staple scream meme in fan videos, used whenever a hero loses composure completely. Its popularity endures because the performance is sincere in context but absurdly intense out of context.