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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In an age when the corners of the world have been scoured for their secrets, only one place remains unexplored–a massive cave system known as the Abyss. Those who traverse its endless pits and labyrinth-like tunnels are known as Cave Raiders. A young orphan named Riko dreams of following in her mother’s footsteps as a Cave Raider, and when she meets a strange robot when exploring the Abyss, she’s one step closer to achieving her goal! 
(Source: Seven Seas Entertainment) 
Notes: 
- Includes the 4-chapter "How Are You? Somewhere" side story. 
- Nominated for the 11th Manga Taishou Awards (2018).

A compilation film recapping the first half of the anime series. 
 
The enigmatic Abyss is an unforgiving and deadly place. Despite the dangers, it still captures the imagination of explorers such as Riko who wishes to follow in her mother’s footsteps and trains hard to become a Cave Raider. One day, she receives news that her mother died in the Abyss, yet a mysterious note tells Riko that her mother may still be alive. Vowing to uncover the truth about her mother’s fate, Riko embarks on a journey with a humanoid robot boy named Reg. Together they will discover if they have what it takes to survive where so many others have perished. 
 
(Source: Sentai Filmworks)

María José Estévez is a Venezuelan voice actress, social communicator and journalist. She is currently living outside of Venezuela, in Miami, Florida.

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