Mirror War

Kiyo Yumito lives a relatively normal life, until he meets his imaginary friend from his childhood. She is real, and she has brought back bad news. Within the two parallel universes, he does not exist in the second, thus making him an anomaly. With that he enters a deathgame hosted by god herself, darkness. Little does Kiyo realize how little it matters whether he believes it ... Carried over from Webtoon since 2021