After being banned from his favorite Virtual Reality Arena game Rising Heroes, Milo decided to play a different game to pass the time until his ban runs out. Encountering the unfinished game The Master Dungeon by chance, he's decided to play as a dungeon in a fantasy world. Though his heart yearns to return to the competitive esport environment of Rising Heroes, his strange ideas bring about combat learned from his favorite game unexpectedly brings about ripples of changes. Will his dungeon bring about success in The Master Dungeon when Milo's commitment is shaky?