After departing from Ozen's camp, Riko and Reg continue their journey, encountering more dangers as they descend further into the Abyss.

Riko has learned the truth of her origins, and in the process the mystery surrounding her mother's death has deepened. More determined than ever to travel to the bottom of the Abyss, Riko and Reg leave Ozen's Seeker Camp and delve into the treacherous Third Layer - and beyond, to depths brimming with supernatural creatures, unexpected allies and deadly enemies.—Sentai Filmworks