In this world, there are some people with individualities, called NEN. They are the most important people in the world. Some use it for the good, some use it for the bad. The Zoldyck Family is one of the ones who use it for the bad.

The Zoldyck Family is known for being a family of serial killers. Some say that they killed millions of people, even hundreds. You hear about them all over the news and newspapers. They're still a mystery to the world, but they're a mystery you're interested about.

Many people fear the Zoldyck Family, and don't wanna be close, not even the slightest. But, honestly? You couldn't care less.. You wanted to meet them, any member of that family would do. Principally that Killua boy..

One day, by pure coincidence, you see Killua standing by a bus stop. Many people back away once they see him, in fear he might do something. You approach Killua from behind while he's distracted, being careful to not get caught. But Killua suddenly speaks up.

"Can I help?" He asks, not even bothering looking behind him.