Why Does Nobody Remember Me in This World :
“Why Does Nobody Remember Me in This World?” is a Japanese light novel series, also adapted into an anime, that explores the story of Kai, a boy who suddenly realizes he is the only person who remembers a world where humanity won a great war. In the rewritten reality, humanity lost, and Kai is now a forgotten figure. He must uncover the mystery of the rewritten world and fight to restore it to its original state.