Riko, Reg, and their new friend, Nanachi, continue their journey down the Abyss and arrive at the 5th layer. But in order for them to continue to the 6th layer, they must encounter the haunting figure of Nanachi's past: Bondrewd the Novel.

Nanachi and Mitty's past is revealed; Riko is on the mend after her injuries.

Nanachi sends Reg on a mission to find certain items that could possibly save Riko; Nanachi reveals a little bit more about themselves.

Reg and Riko run into trouble deep in the fourth layer where they meet an interesting creature, but they are not sure if the creature is friend or foe.

Riko and Reg find the den of a Madokajack.

Ozen leaves Riko and Reg to prove that they can fend for themselves.

Riko finds out that she was revived by the relic.

Riko gets to thank Ozen;. Reg receives his extendible arms

Riko and Reg encounter a large bird that can mimic cries for help.

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

Reg goes on his first cave raid; Riko makes preparations to go into the Abyss to find her mother.

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

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