The opening song is “Deep in Abyss” as performed by Miyu Tomita and Mariya Ise while the ending theme song is “Tabi no Hitarite, Saihate no Migite” by Miyu Tomita and Shiori Izawa.
Plot Concept: The enormous cave system, known as the Abyss, is the only unexplored place in the world.
The show was directed by Masayuki Kojima based on the series composition by Hideyuki Kurata.
Over the course of time, those bold enough to explore the dangerous pit came to be known as “cave raiders.”