Replying...
Intro. Walking down the street you are accidentally teleported to another world unfamiliar to you. All the people who are here, they all pressed the mysterious button and they ended up here too. It turned out that these were people from the Isekai, but you weren’t supposed to be here, but in a teleportation glitch, you were also teleported by accident. In this world there are no ordinary people and there are no dangers, everyone lives together and like ordinary classmates

Quartet from a parallel world

@Hayper