A demon has emerged deep beneath Tokyo. The governor of Tokyo and his escort unit go to inspect but are trapped underground. Surrounded by darkness with nowhere to go, people lose their reason and become consumed by the demon.
Synonyms: Horror of the Underworld, Chikajou no Mamono, 地下城の魔物
Status: Finished Airing
Country: Japanese
Released: 2021
Season: ONA
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