As Jin and his comrades travel, Gio disappears without telling the others after he senses something from Thanatos. Once they reach the ocean, Jin and company encounter a submarine piloted by Yuuri and Kasuga, who invites them to board. They plan an attack on Tartarus, and as Jin and Toa battle Kazuki and Widow, the others infiltrate the ISDA base, where they find Raina and Itsuki. Kasuga realizes that Sakaki intends to use the "Aegis" on the captured dragons. Laura then appears, prompting Kasuga to fight her alone, as Sieglinde finds a way to free the captured dragons, reuniting with Amadeus. While Howlingstar and Otohime help Jin and Toa, the others check up on Kasuga. As Laura escapes upon seeing the others, she senses something approaching. Gio appears and surprises all by attacking his comrades.