The rebellion assassin's path toward heroism.

The world has converted to a society of superpowers.80% of the whole world's population possessed quirks.Heroism the profession everyone dreamed of came into reality.The manifestation of super powers also made people realise with power they can do anything.Many people's desires and goals brought them to villainy.

The zoldycks were an assasin family which was so powerful that it defied any superiority. They are rented for the job and they do it no matter what.Killua at the age of 12 had enough of killing people, living in physical and mental abuse,getting used as a tool.So he runs away from his home to japan and starts his new life.