Water magic has long been the cornerstone of House Weilkast's prosperity in the Belbronn Kingdom, but Lara Weilkast can't wield this magic. However, her cruel family marries her off to the Turmhut Kingdom's former crown prince, Roy, under the pretense that she has the ability to purify his country's polluted water. The more Roy and his servants treat her kindly, the guiltier Lara feels about her deception. Will she be able to save the Turmhut Kingdom from its plight despite her inability to control water?