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 name Reg. Together, they will discover if they have what it takes to survive where so many others have perished.
Source: Sentai Filmworks
This movie is a condensed version of the first eight episodes of the 2017 series. I thought I would mention that first since it isn't explicitly stated in the description. if you are interested in it and have the time (and right as I'm writing this in April 2020 most of us have the time) I would recommend you watch the series instead. If you don't have the time or aren't sure if you are interested enough invest the time to watch the series I guess this could serve a purpose, however I would not recommend it. My score listed here is for the series as a whole.
There are no custom lists yet for this series.