Fifty years have passed since dungeons first appeared on Earth. Dungeon exploration and live streaming are considered the norm for the people. <br><br> Kuga, who became a dungeon explorer alongside his close friends, ends up being banished from his party due to him being a supposed "jack of all trades, master of none" hero. <br><br> Amidst his despair, Kuga finds himself thrown into the hidden boss room, famous for making explorers unable to step foot into a dungeon ever again. There, he encounters a beautiful female vampire named Alicia. <br><br> Though he’s prepared to meet his end, Alicia, captivated by the so-called streaming, has other plans and asks him, "Could you teach me how to stream?" <br><br> With nowhere else to go, Kuga reluctantly accepts her proposal and thus begins their unprecedented dungeon explorer-hunting streams. <br><br> For some reason, their stream quickly went viral like crazy, and Kuga then began to awaken some unknown powers...? <br><br> And meanwhile, something strange is happening to the party members who banished Kuga...