High school girl Erika may be on Kyoya's leash, but she's determined to break free and unleash his heart!

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 lands an after-school job to earn spending money for her senior trip and runs into her old middle school friend Terasaki, whose flame for her is reignited upon their reunion. Meanwhile, Kyoya ends up on the trip-planning committee with Kasai, a female classmate who develops a fascination with him. With so little time for each other, will Erika and Kyoya's love survive?