Located in the center of a remote island, the Abyss is the last unexplored region, a huge and treacherous fathomless hole inhabited by strange creatures where only the bravest adventurers descend in search of ancient relics. In the upper levels of the Abyss, Riko, a girl who dreams of becoming an explorer, stumbles upon a mysterious little boy.
Starring Miyu Tomita, Mariya Ise, Shiori Izawa, Misaki Kuno, Maaya Sakamoto, Mutsumi Tamura, Manami Numakura, Aki Toyosaki, Sayaka Ohara, Manami Hanawa