While exploring the Abyss, Riko comes across something she has never seen before. How does this new discovery impact her?

Riko and Reg find out more about their past but the question still remains, who or what exactly is Reg?

Reg goes on his first cave raid! Meanwhile, Riko makes preparations to go into the abyss to find her mother.

Riko and Reg start their adventure into the Abyss, while there they run into an unexpected familiar face.

Ozen reveals more about the Abyss as well as the truth behind Riko's origins. What will happen when Ozen shows her true colors?

Reg and Riko continue their descent after they leave Ozen's Seeker Camp. Riko's mettle is tested as Reg passes out and she has to fend for herself.

Nanachi shows Reg the truth about the Abyss. Meanwhile, Riko is still recovering from her injuries when she has a strange dream.