Aya, Yoji, Ken, and Omi are four young men who are elegant florists with an eye for beauty during the day but at night, when the moon rises, they comprise the boys of Knight Hunters, an assassin group which eliminates certain menaces to society. Led by the somber and silent Aya, the team consists of Ken, a wide-eyed former athlete, Omi, a young computer specialist, and Yohiji, a suave ladies man, each of them come with a tragic past that gives them the passion to fight.