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Leilin asked question about made a horrible mistake

So i've been watching and reading this anime its 100%good i had been sticking to only that one anime for 6 years and my fav/comfort character dint die in s1-3 so i thought maybe my fav/comfort character wont die in final season but when the final season arrives on the very 1st trailer she suddenly died and idk what to do with my life bc i grow in t......