Emily and Randall are a young couple who escape to their beach house on vacation to find their feelings again. During this time, a couple of old friends of Randall's father visited them, and the four of them got along very well. But the environment around the beach house became more and more strange, and the scenery of the beach and the creatures in the water gradually became weird. They seemed to be infected and felt trance and uncomfortable, and Emily had to try her best to figure out what was going on before it was too late. . .