The original plan for the third birthday of Yuka and Sasuke involved only four people.
Because of his heavy workload, Uchiha Fugaku could not make it home on time. Itachi was also supposed to be on a mission, but he had managed to finish it a whole day early and hurried home simply so he would not miss his younger siblings' birthday.
Yuka had never mentioned the matter to Naruto. Naruto's background was special, and Uchiha Itachi had explicitly forbidden bringing him into the village. Since Naruto had no way of coming, Yuka naturally said nothing. It was better to pretend not to know anything and just get through the day somehow, leaving things for the future when they grew up.
Chapter 46