Killua is allowed by his family to leave the Zoldyck estate with Alluka, whose Threat 4 status requires the supervision of several butlers who are instructed to bring her and Killua back home if the latter ever leaves Alluka's side or allows any of their secrets to be leaked. Besides Gotoh and Canary, Killua finds himself being supervised by Tsubone and her granddaughter Amane. Alluka then suddenly asks for Tsubone's pinky fingernail, Tsubone gladly doing so before concealing herself so Alluka cannot make any more requests...