What happens in the first season of H2O Just Add Water?

In the first season of "H2O: Just Add Water," three teenage girls—Cleo, Kim, and Emma—discover that they transform into mermaids whenever they come into contact with water. Each girl grApples with her newfound powers, which include the ability to control water, while also navigating the challenges of adolescence and maintaining their secret. The trio faces various obstacles, including the threat of exposure and the jealousy of others, particularly from a boy named Zane. Throughout the season, they learn to embrace their identities and the bond they share as mermaids.