Sunraku and Araba explore the inverted Abyss capital R'lyath, whose reality is distorted by Ctarnidd's power: The ocean floor forms the sky, living fish turn into undead hybrids, and dead fish transform into aggressive mermaids (Mermesis Bagroon).

An Arctus Regacles (Level 125), a draconic fish monster, is summoned through the Random Encounter ability. Sunraku uses Gravity Zero and the VIT-optimized Ducusram swords to exploit its weaknesses—limited mobility in narrow alleys and creeping poison damage from fishman attacks. After an intense battle, he defeats the monster, gathers resources, and meets up with Emul, Rust, Ceecrue, Mold, and Akane in a safe zone.

The group plans their strategy against Ctarnidd within the 7-day countdown ("Abyssal Time"):

- Sealing Generals in city towers (e.g., Clionaire, who blocks magic) must be defeated.

- Logistical coordination for playtimes, as Sunraku has real-life obligations.

Araba reveals his familial rivalry with Ctarnidd and hints at a weakness: An attack on its left eye could defeat it. Psyger-0's absence raises questions. The episode ends with preparations for the final battle, while a post-credits scene shows Sylvia and Johnson challenging a top player in Japan.