A continuation of the epic adventure of plucky Riko and Reg who are joined by their new friend Nanachi. Together they descend into the Abyss' treacherous fifth layer, the Sea of Corpses, and encounter the mysterious Bondrewd, a legendary White Whistle whose shadow looms over Nanachi's troubled past. Bondrewd is ingratiatingly hospitable, but the brave adventurers know things are not always as they seem in the enigmatic Abyss.
- Year: 2020
- Country: Japan
- Genre: Animation, Adventure, Fantasy, Mystery
- Studio: Kinema Citrus, KADOKAWA, CygamesPictures, Takeshobo, AT-X, Sony Music Entertainment, Kanetsu Investment, Global Solutions, KADOKAWA Media House
- Keyword: child abuse, immortality, underground, gore, exploration, survival, human sacrifice, based on manga, robot, brutality, mature, mutilation, adventurer, dark fantasy, journey, seinen, anime, rotten world
- Director: Masayuki Kojima
- Cast: Miyu Tomita, Mariya Ise, Shiori Izawa, Toshiyuki Morikawa, Inori Minase, Sayaka Ohara