Unable to bear their debt-laden father's selfish behavior, Asagi and his sister ran away from home. At a loss for what to do, they were helped by Kaname, a rich heir they happened to meet at a cafe. "Would you like to make a contract with me?" It was a deal they couldn't refuse, a strange cohabitation life is about to begin. A twisted love story between a devious rich heir and a poor boy trying to protect his sister.