It depends on whether or not the servant is limited. Nero isn't so she'll be available in the story banner, although the odds of getting her are so low that it's not really worth it. If you want a servant it's always better to roll during a rate up. For limited servants (such as Gilgamesh) the banner usually says something like special summoning or limited servant or whatever and that means they won't be added to the story banner after the rate up is done. If you miss out on them you can only wait for the next time they're available.I have a question about these pulls. Currently Umu has a pull rate up of her own. Once this event is over, is she no longer a part of the pool, or does she just go back to being at the same percentage as any other 4* servant? I'm not really dying to get her, but just for future reference, if I miss out on a servant's rate up, will I never get them in the future? I mean if I didn't get them in the rate up event, chances are I will never get them outside of it lol, but you know what I mean. Even if it is .05% lol.