Luka initially travels to this area upon receiving a request from Meia, who wishes to marry her couple, and uses the Ball of Guidance to meet with Kraken. Along the way, he is confronted by a Jellyfish Girl, a Sea Anemone Girl, and finally a Anglerfish Girl until coming across the great temple that houses the southern seas ruler. However, when Luka tries to explain his intentions and lets a slip that he's a "hero", Kraken immediately assumes that he wants to steal the Blue Orb and attacks. After an intense battle with Luka ultimately unlocking his hidden powers, Kraken finally comes to realization of his intentions and weds Meia and her couple, then slingshots Luka back to the surface as "compensation" of her hasty actions.
In Chapter 2, Luka returns to Kraken, with no interference from other monsters, and asks her for the Blue Orb. She willingly hands it over and wishes him well on his journey.