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?

When Kyoya learns Erika gifted Kusakabe the same sweet she made for him, he loses it--and the pair's days as a pretend couple are over! Complicating matters, Kusakabe asks Erika out for White Day. But is Erika truly ready to drop Kyoya for good?