Transmigrating Simultaneously, but Where Am I?

Ji had yet to do anything big when he died in an accident and restarted in a new world. He would grow quietly: I am not yet strong, but when I am, things will change. In this fantastical world, he discovered another version of himself: Victory's wind is blowing from behind me, Ji! Then one day, he realized that familiar faces were actually characters from the light novels, anime, and games of his previous life. Where the hell did I end up? (Worlds so far: So I'm a Spider, So What?; Arifureta: From Commonplace to World's Strongest; Charlotte; Overlord)