Killua has a twin sister, an insanely possessive yet dangerous one who had a painful past story that Killua doesn't know of...
Nobody knows what her true objective is — whether to destroy or to protect him — not even herself.
Thank you and enjoy! :)
"As far as I'm concerned, there're only three main categories of people in this world: the ones I entertain, the ones I kill and the ones I don't kill because Killua doesn't want me to."