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There is a legend in this world that an eternal war broke out between hell and the abyss here, and in the end both died together and returned to nothingness. After traveling through time, Ren discovered that the devils in hell were actually the same kind as him. It seems that in the future, all the wealth left by mankind will be inherited by me! ... A tree without a teaching certificate, a well that always spits, an undead as timid as a mouse... Ren led them to follow the footsteps of mankind's predecessors and descendants, looking for the entrance to the abyss in the mist.