The demon gunner, Deadly shooter appears

It has been 7 months since James started his vigilante work. Tonight there hasn't any crime occured, until now. They were resting in the cave. Jack told James he want to read some good stories. James had an idea what he get for him. However, when he was going to bring it, the alarm ringed. They checked it, it reported that 30 men were murdered with the use of guns. They put on their clothes and went to investigate. They checked who were victims and details. All of the victims died with just one shot and it was completely precise. If this was the situation, the person who killed them must be an expert marksman. James had a hunch who might have done this. He said to Jack: Follow me. I have a hunch who might be behind this. Jack said: As you command, Lord dark nightmare. There was someone with a gun approaching another person. He was going to shoot that person. Jack jumped and pushed the victim and James knocked the gun out of that person's hand. James said: Omae (So you are Deadly shooter.) That man said: Ore Temee (Yes, I am. What do you want, getting in my way?) James said: Ore tachi Omae (We are here to stop you from continuing this murders.) The deadly shooter took out another gun and shoot toward James, but James showed an abnormal speed and agility and was easily able to dodge all bullets. This shocked shooter. Then he took out a machine gun and shoot 20 bullets. James speed and agility was extremely abnormal that he was able to dodge all of them. When he was able to dodge them, he jumped and knocked the gun out of shooter's hands. Then shooter said: Temee (It seems like you have some skills, now let's try fighting unarmed.) They got ready to fight. The shooter knowed martial arts too. The fight was intersting and they fought for 30 minutes like this. Then shooter said: Impressive. You fight well, let's meet again and do this again. Then he throw a smoke grenade and run. James and Jack took the victim to his house. Then they returned. Jack said: (dark nightmare-dono, is there a good story book that I can read to be entertain.) James said: (Yes.) Then he went and brought him a story book. It was a Hercule poirot story. James said: My parents bought stories like this when I was a child. I read them when I had free time and it was very interesting. Jack opened it, it was a very interesting story.