aNIME INFO
Chikajou no Mamono
Type: ONA
Plot Summary: 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.
Genre: Horror
Released: 2021
Status: Completed
Other name: Horror of the Underworld; 地下城の魔物