Five years have passed since dungeons suddenly appeared on Earth. One day, Yashiro Yoruichi, a highly skilled explorer who had been attempting dungeons from the very beginning and was expected to have a bright future, was attacked by an irregular monster known as a trial and lost the sight in one eye. As a result, Yoruichi was branded a failure, but she refused to give up! This is a dungeon fantasy in which she uses her unique power to fight back from the depths!