A mermaid’s supernatural beauty serves one purpose: to lure a sailor to his death. The Massacre is supposed to bring peace to Eriana Kwai. Every year, the island sends its warriors to battle these hostile sea demons. Every year, the warriors fail to return. Desperate for survival, the island must decide on a new strategy. Now, the fate of Eriana Kwai lies in the hands of twenty battle-trained girls and their resistance to a mermaid’s allure.