
For those wondering, Fate/Extra Last Encore! For those worried that you need to know anything about the Fate/ Multi-Universe, you don't. New timeline! So you don't need to worry about that.
However, for those who know nothing about the terminology, you are going to get just thrown in the deep end. It seems that Nasu (creator) and Shaft (studio) are keeping with the theme of throwing you in the deep end and being as confused about everything as can possibly be. Magibabble and Trekbabble are going to be hitting you like a ton of bricks, but that's okay because it looks like they will explain things. Though you are going to be confused. Unless they absolutely fuck this up, it is as intended. The more you get to know our lead, Hakuno, the more you'll understand why it is done like that.
BTW, for those wondering "hey, is this Saber the same as Saber in Fate/Stay Night", no. She's also not like an older Red Saber from Fate/Aprocrophya. Though this Extra's Saber could definitely be the older relative of Saber's Fate/Stay Night by about 500 years. If you are wondering how the hell that works, I'll explain, but in a spoiler. Only look if you want to be spoiled! Though the show should quickly explain who this Saber is. She doesn't exactly try hiding who she is. She's a little too proud of that.
Spoiler: ONLY READ IF YOU WANT ME TO SPOIL show In real life King Arthur has been thought of possibly being a Roman General. Therefore, if you look back by 500, from the last 5th century to roughly 50 A.D. and the Roman Empire, you can guess who I'm saying Fate/Stay Night's Altira/Arthur is related to.
Spoiler: For those who just want to know and too lazy to google show Fate/Extra's Saber is Nero Claudius.
Also, she's more of a tragic heroine than in our timeline. Though then again, you can practically say that of all the people in Fate/ Multi-Universe get shafted in some sort of way or another. Furthermore it becomes a running gag that a ton of Sabers look like Altira.