Zac is a teenage boy who decides to camp on Mako Island, unaware that three mermaids, Sirena, Nixie and Lyla, who are guardians of the island, are watching him. That night, when the full moon rises, the boy comes into contact with the magic water of the Moon Pool. The following morning, Zac wakes up discovering he has become a merman with a fish-like tail and the ability to control and manipulate water. His new-found merman abilities will cause problems for the mermaids.　　The three mermaids, curious about living on land, are transformed into humans while in the moon pool during a full moon, now having the ability to live like humans.。楚翔点了点，徐长天也不再多说，甚至连自我介绍都不做，这一点楚翔早已习惯了，身份和名字在这种乱世已经变的不重要，徐长天把众人招呼到一起，然后让张德兵去CRV上取来食物和水。……