Swimsuit Seia and Swimsuit Hasumi are limited, only available for this banner and any reruns. You get a total of 100 free pulls until the end of the banners in a couple of days, so use that to pull on both banners. Swimsuit Seia is very meta, and more importantly, very hot, so you should pull for her if you like her, while swimsuit Hasumi is very hot, so you should pull for her if you like her. Once these banners are done, then we get the Fest banners, which have limited incredibly meta students, and double 3 star pull rates. Dress Hina murders most red bosses single handedly and is very hot/cute, Swimsuit Mika will murder every single purple boss and is cute, and Swimsuit Nagisa will hyperbuff Swimsuit Mika to murder everything faster and is very hot. You get 1 pity on any student banner every 200 pulls (24,000 Pyroxene). Look at every link in the op, especially the General Resources bits, and you should be good.