The countless dungeons that suddenly appeared on modern Earth have now become a part of everyday life. Yuuto Kurashiki, a young man who has become a hikikomori for some reason, challenges the dungeon to break through the dead end of his life. However, the unique skill given to Yuto was ironically "escape". Not only is it difficult to use, but it also has a huge negative correction to the ability value, which is the lowest and worst failing skill.