Why Does Nobody Remember Me in This World?

"Does anyone remember the true world?" After the fierce competition for dominance among the five tribes of the planet, humanity emerged victorious under the leadership of Sid. However, the world that Kai, a young boy, witnessed was suddenly "rewritten." In this altered reality, dragons and demons ruled while humans were defeated due to Sid's absence in the tribal wars. To make matters worse, nobody remembered Kai. Nevertheless, when Kai meets the enigmatic Rinne, he decides to challenge his predestined fate. In a world devoid of heroes, Kai wields the sword of heroism and trains in martial arts to confront the dominating races that govern over the world.