Question

in what anime does the main character thought he got isekaied in a room with other people

Answer 1

One example of an anime where the main character believes they have been isekai'd (transported to another world) and finds themselves in a room with other people is "KonoSuba: God's Blessing on this Wonderful World!" (Kono Subarashii Sekai ni Shukufuku wo!). The protagonist, Kazuma Satou, dies in the real world and is given the chance to be reborn in a fantasy world with the ability to choose a special power or item. However, upon arriving in the new world, he realizes that it is filled with comically flawed characters and absurd situations.