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.。楚阳甚至自己都没有发觉，自己的丹田之内，那原本已经被分薄的鸿蒙真丝，在慢慢地增多这，原先只有一个丹田的时候，鸿蒙真丝乃是悬浮在正中间。……