TV
Series Information
FormatTV
Episodes13
Duration25 min. per ep.
AiredJul 7, 2017 to Sep 29, 2017
SourceManga
RatingR - 17+ (violence & profanity)
Animation Studios
ProducersMedia Factory • AT-X • Sony Music Communications • Sentai Filmworks • Cygames
External Links & Streaming
Official & Community Sites
Collect Physical Media
Shop Blu-ray & Merch on AmazonSynopsis
The "Abyss" is the last unexplored place in the world. Strange and wonderful creatures roam within, and it is full of precious relics that present humans can't recreate. Those that dare to explore the depths are known as "Cave Raiders." An orphan girl named Riko lives on the rim. Her dream is to become a Cave Raider like her mother and solve the mysteries of the cave system. One day, Riko starts exploring the caves and discovers a robot who resembles a human boy. (Source: Anime News Network, edited) Note: The last episode aired with a runtime of ~48 minutes as opposed to the standard 24 minute long episode.
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