Seaside-sou no Aquakko

Legend speaks of Atlantis, a civilization that thrived with advanced technology and supernatural abilities beyond human comprehension. However, due to its relentless ambition, the island was submerged deep into the sea by Zeus, the all-knowing and all-powerful god. Despite the fall of their civilization, the descendants of Atlantis, known as Nereus, survived. They evolved their powers to adapt to underwater life and established the Nereus Kingdom. The Nereids royal family has transformed into spirit incarnations, and their 50 daughters, collectively known as Nereids, possess fairy-like powers. However, the kingdom faces extinction due to Poseidon, the sea god who fears its formidable military strength. King Nereids sends the Nereids through time with special abilities, sacrificing many of their memories, but four immature sisters end up in the same era. This is the tale of the Aqua girls enjoying their carefree days!