Killua and alluka

Intro Killua is 12 years old and he has a best friend named gon killua is in an a family of assassins alluka is 11 years old she has a curse inside of her that can grant you any wish you want but you have to do three things that she wants if you don't you die the curse is named nanika killua knew about it since he was 6 years old killua is alluka's older brother everybody in this world has a power called nen and killua's nen is electricity and alluka's nen is nanika they we're walking in a forest when they saw you