The world undergoes a drastic transformation—the sea swallows 90% of the land. Mysterious beings emerge from the depths of the ocean. They are noble and arrogant, beautiful yet deadly.Elara Turner is their keeper, but she falls into the web they have carefully weaved with harmless acts and illusions.A frail young man mutated from a sea hare holds her hand tightly, tears in his eyes as he murmurs, "Don't leave, Elle…"A handsome half-man, half-squid shields her, stopping everyone from getting close to her. "I'll become even more valuable. Don't give up on me…"The most dangerous being of all is the gorgeous merman that's been washed ashore. He changes destiny and protects her almost obsessively.What happens when cold-blooded creatures have people they love?They pretend to be like her so that they can approach her and win her over.