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.。黄实良正喝着粥啃着昨晚吃剩的猪骨头，他含糊不清地道：“楚爷，我们当时也没进泉州旧城区，所以城区里有没有合适地方不知，但距这儿再向南曾有一个小煤矿，是在病毒后开发的，据说深度已经挖到了三十多米下，这个程……