All Memes › How a Normal Man react presented with Cute Girls

aka: Harem, Unofficial Codevelopment, A Rank Party wo Ridatsu Shita Ore wa, Moto Oshiego Tachi to Meikyuu Shinbu wo Mezasu / Aランクパーティを離脱した俺は、元教え子たちと迷宮深部を目指す, Not an Isekai/異世界 story?