A sudden crack space happen in the rimuru room while he sleeping, sucking him into another world where a deadly pathogen called punishing virus laid waste to the earth's surfaces. Ciel, rimuru partner try to wake up his master, but for some unknown reason, he didn't wake up. Realizing his master body being corrupted by the virus of the world, ciel forcefully takes over rimuru body, pull his soul and keep it in inventory. [Report: the world air is dangerous, corrupted any organic being like master body, but you don't need to worry master, I find a way to save your body and awaken you]