Mondo Fujieda harbors deep feelings for Izayo Gorugo, a girl from a family of assassins. After an embarrassing incident, she swears to avenge the humiliation by taking his life. Fortunately, she relocates, putting some distance between them. Time passes, and when she returns with vengeful intentions, Mondo finds himself facing a deadly adversary. How will he cope with a proficient assassin determined to settle the score?