"Assassination — It’s the family trade. We all take it up. My folks see me as an exceptional prospect. But I don’t see that I should have to live up to their expectations." —Killua
Yo-Yo is a(n) item from Hunter X Hunter. It's mainly received from Killua because Killua plays with Yo-Yo's in the show.
Yo-Yo is obtained by completing Killua (NPC)'s quest.