Retired assassin Shimojima Eiji now stays in a private room at a nursing home. One night he is visited by the ghost of Kokuchi Takashi. Kokuchi is the older brother like figure who taught Shimojima the ABCs of killing. Ironically, Eiji later killed him. Kokuchi says he has a job for him that pertains to saving the life of Nurse Harakuchi Saori, who has always treated Shimojima kingly. Harakuchi is in a relationship with Kawahashi Shizuo. Kokuchi says Kawahashi plans to kill her in order to succeed the father-in-law's hospital. Why does Kokuchi want to protect Harakuchi so much? Eventually, Shimojima decides to take this "last job." He plans to lure Kawahashi into the dense forest, but with what excuse? Before putting his plan into action Shimojima overhears a shocking and unexpected conversation that Kawahashi is having. Now Shimojima wants to know what is actually the truth?