Gakuen Sensuikan-tai: Mermaid Girls

Synopsis:

A stunning girl in a swimsuit aims a water gun—Girls Splash Action begins! A mysterious extraterrestrial creature known as the Trench Walker, capable of walking along the seabed, suddenly descends upon Antarctica. The creature's arrival triggers a catastrophic rise in sea levels by 70 meters, submerging major cities across Japan, including Tokyo. As the waters of Earth begin transforming into a powerful substance known as the "Water of the Gods"—or Nectar—those unable to adapt to its properties face certain death. In the midst of this global crisis, a select group of girls who have developed the ability to survive in the Nectar-drenched world embark on a daring mission. Equipped with special gear, they board a submarine and head to the frontlines, determined to reclaim the Earth from its new, aquatic fate.