A dungeon explorer, or dungeon tuber, is a person who explores dungeons while streaming. On his first day of broadcasting, a rookie dungeon tuber, Sekai Kotoba, is accidentally transported to the lowest level of the dungeon, which he has not yet explored. The bottom level is a sea of lava, and he is suddenly doomed! He is level 2, his skills are non-combat related, and he has no knowledge of dungeons. The only people he can rely on are the listeners on the feed! Aim for the upper levels by relying on the comments!