I, Cain, the first vampire in the world, came to the human world after sleeping for tens of thousands of years. I saw the cartoon Prince of Tennis, which is very popular among teenagers, and its persistence for tennis. It made me uncomfortable. Human beings are selfish and greedy animals. I wanted to see what would happen to them in the future, so I came to the world of Net King. I thought it was just a game, but I didn't expect that I would be trapped in this game and unable to extricate myself...