Something called "Blue Void" descends on the earth and uses black holes to randomly swallow humans into a world of infinite terror. Here, emotion is the biggest weakness and calmness is the law of survival.
Rose - a woman born with a lack of emotion, was supposed to be an ordinary flower shop employee in the main world, but she fell down the steps and accidentally hit a black hole. She was transported to a train that was always moving, and was forced to put on the black and white saint's costume and go on an adventure.
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