Is this a Crossover? - (Isekai Quartet X Male Reader)
After (Y/N) (L/N)'s Crazy Adventures in his Reincarnation and met Kazuma and the others that he had met so far. So right now, one day they see a big red button on the table of the mansion. Kazuma was cautious, but Megumin had literally pushed the button, as (Y/N) and the others were transported back into the modern wo...