Planet of water and greenery, Aquafall. A group of meteorites that suddenly fell release evil creatures, spreading risk of extinction to all land-dwelling creatures.

Syrop's sets her sights on Bahamut, the biggest princess in town and daughter of the grand mage, as the next member of the Aquafall Defense.

The guardian Yurlungur suddenly appears from out of a swamp. In order to save Yurlungur, who swallowed a foreign object now stuck deep in his throat, Leviathan and her friends enter his body to search for the object.

When Syrop visits Jörmungand and her large family, she meets her three younger sisters and foster parent Travis, she learns of her love for her family.

Leviathan is unable to forget about her older brother. Meanwhile, bringing Jörmungand with her to carry her luggage, Bahamut goes to vacation on the beach.

Moments after realizing the beach at low tide resembles the location she saw in her dream, an enormous Lucasite suddenly emerges from the ocean.