Fed up with being hopelessly single, high schooler Erika makes up a boyfriend to fit in. When her lies start to unravel, her schoolmate Kyoya offers to be her pretend boyfriend--for a price. With no other choice, Erika finds herself at the mercy of a blackhearted prince! But is Kyoya truly as blackhearted as he seems?

Erika's heart is aflutter after seeing a new side of Kyoya. But if she confesses her love to him, she risks destroying everything they've built. Plus, she has no idea if Kyoya feels the same way. One thing is for certain, though--his sadistic side remains in top form!