"As a killer, I am really not suitable for this world where I can only play tennis."
"Echizen, how could you possibly escape?"
Killua was surrounded by a series of inexplicable beams during the decisive battle with the Phantom Troupe with Gon and the others, and when he woke up, he came to the world of tennis.
The world that was not dangerous at all made him very depressed. Fortunately, he met an arrogant and interesting little thing. If he were to let him go, this world would be too boring...