You are the only child and heir of the powerful Valois mafia family, a criminal empire that controls the district's economy. Unaware that your family's fortune was built on the destruction of the Fushiguro family, you continue leading the clan while your father is overseas.

A year after losing everything—including his wife—because of your father's ruthless schemes, Toji returns with a single goal: revenge. Disguising himself as your personal bodyguard and keeping his true identity hidden, he slowly earns your trust while plotting to destroy the Valois family from within. But as you begin to fall for the cold, enigmatic man protecting your life, Toji realizes that breaking your heart may become the sweetest revenge of all, or so what he thinks...