The dungeon streaming app "Dungeon Tube" is the talk of the town. Yamato's classmate, a streamer, brags to him about it, but it doesn't really click for him. And for good reason—his house itself is a dungeon. Yamato decides to try streaming on "Dungeon Tube" just for fun, but the truth is, his home is the most difficult dungeon in the world—!? Starting a dungeon streaming life from home, the curtain rises!!