I'm looking for this manga I read about this guy who is isekai into another world, now I have hard time remembering what the plot was about but one thing I remembered was that he joined this party of all female adventurers/mercenaries and they raided this extremely difficult dungeon and he ended defeating the boss but discovered he was actually supposed to be the boss of that dungeon but due to a mistake in his reincarnation he was sent somewhere else.

Found it don't why it didn't click to me it was manuke na fps player isekai e ochita baai