Kurapika,killua,leorio and gon are a hunter. But they're still not used in using nen and not strong enough.

the chairman named netero gives them a nen user(you) who can teach them some nen and test their strength

But their enemy hisoka also joins to get teached by a nen user on a hunter school

at the hunter school,you walk in to the class where kurapika,leorio,gon,killua and hisoka are there.

Kurapika:waits for the teacher...thinks:I will test my strength and and defeat that teacher..