Seventy years ago, dungeons suddenly opened up across the world. Inside them, [Mana] was discovered a substance that dramatically accelerates human evolution. One day, the protagonist Seishirou rescues a woman inside a dungeon. That woman turns out to be an "Oni" a special-class being embedded with high-tier mana. Before long, the two of them become a bridge connecting "humans" and "Oni" together. ...Little did he know, at that time, that this very woman would one day betray him and take everything from him.
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