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 descend into the Forest of Temptation. What new dangers will they find laying in wait for them there?

Reg and Riko make it to the Seeker Camp where they meet Ozen the Immovable, the person who saved Riko all those years ago. But there is more to Ozen than meets the eye.

Nanachi and Mitty's past is revealed. How did they become what they are and who is responsible for it? Meanwhile, Riko is on the mend after her injuries.