ワン・マン・ヒーロー ～女性しかダンジョンに入れない世の中で、男の俺がダンジョンに入れてしまったんだが? オマケに出れないんだが!? (Associated Names)

In 20XX, mysterious dungeons appeared around the world. Countries immediately mobilized their armies to investigate the interiors. However, only female soldiers were able to actually step inside. For some unknown reason, men were unable to enter the dungeons, as they were flung back at the entrance. Twenty years later, dungeon explorers became the most desired…