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A strange disease is linked to a mysterious hole that leads to an underground world: the Asylum. "Sleepers" come to this world to fight strange monsters and retrieve unknown resources. Now, a young man who dreams of being a hero has arrived at the Asylum.
First Air Date : Oct 13, 2021
Last Air date : Dec 29, 2021
Episode : 12 Episode
Season : 1 Season
Runtime: 24:14 minutes
Studio: Tokyo MX
Country: Japan