Phy Sew lu, ele tis Es feo r-delis ec I., Why Does Nobody Remember Me in This World?, Why Doesn't Anybody Remember My World?, Why Nobody Remember Me in This World?, 어째서 아무도 나의 세계를 기억하지 않는걸까?, なぜ僕の世界を誰も覚えていないのか?, 为何无人记得我的世界, Naze B, なぜ僕の世界を誰も覚えていないのか?, Naze Boku No Sekai Wo Daremo Oboeteinai No Ka?
Why does no one remembers the true world...! The era when the great race of the five tribes competing for hegemony on the ground ended with the victory of mankind led by hero Sid. However, that world was suddenly overwritten in front of a boy Kai. In the rewritten world, Kai saw the scene where humans lost to the five tribal wars because of the absence of hero Sid—here dragons and demons dominate the ground, and Kai is a forgotten existence from all human beings. However, after encountering the mysterious girl Rinne, Kai decides to break this rewritten destiny. In a world without heroes, he inherits the heros sword and martial art and challenges the mighty enemy races who reign.