Arco Wada doing everyone a solid by giving Nero a matching outfit with Hakunon on Fate GO's anniversary. Now we got a burst of fanart like this one because of it. Good stuff.
It was the first time they showed hakunon and nero interact cause theres a flashback of their time together in the first portion of the episode. It was some pretty sweet stuff.
not explained yet. Based on the source material and the title being "Last Encore", I'm assuming it's the previous war's ending where nero and hakunon lost. Then fast forward to the current one where the male one exists and summons nero again. That's probably why it's called Last Encore, it's Nero's last encore/2nd attempt at the war after losing the first time.
Literally the very first scene of the fate extra anime is both hakunon and nero getting killed by the last boss of the video game source material. Hakunon is seen bleeding on the floor with no legs and a hole in her stomach, while nero fights the boss and eventually gets killed herself when she also gets a hole blown in her stomach.
I mean, I thought the whole crickets sound effect thing in reply to the multitude of same-sex parents in anime was a telltale sign but I guess not? Sorry, I really should stop with the whole sarcasm thing when people are riled up.