Fifty years have passed since dungeons first appeared on Earth. Dungeon exploration and live streaming are considered the norm for the people.
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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.
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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.
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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?"
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With nowhere else to go, Kuga reluctantly accepts her proposal and thus begins their unprecedented dungeon explorer-hunting streams.
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For some reason, their stream quickly went viral like crazy, and Kuga then began to awaken some unknown powers...?
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And meanwhile, something strange is happening to the party members who banished Kuga...
