Vampire Hunter Heilo carries out a murder commission for a client in order to find clues that could lead him to the person who murdered his family as a child. The target that Heilo has to deal with is the head of the Rivera group, Hereis. Whilst undercover, Heilo joined Hereis’ company, known for being a big shot in the political world and behind the scenes. Then, he successfully manages to become his executive secretary. However, Hereis’ special treatment keeps causing Heilo’s conviction to falter... What will Heilo's fate be if he falls in love with a man he has to kill?!