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Constant pressure from his family to become the next greatest assassin is what forced Killua to run away from home.
2 years later a relentless pursuit would drive him further away, this time taking his sister with him. Now, as Killua struggles to protect both Alluka and her alternate personality, Nanika, he finds himself growing restless. So when his parents capture him once more, this time holding Alluka hostage, he's almost prepared to give up. He is not, however, expecting the deal they strike with him: Find and bring home his eldest sister, once presumed dead, Allui. Now, together with his best friend and two very unlikely allies, Killua must set out on a journey that will take him who knows where.