Abazure-san, Minami-san and Granny are all parallel universe versions of herself from the future where apparently she made some sort of choice and they came there to help her. (There was also something about a plane crash on the day of the open school visit, so I'm guessing at least her dad is supposed to die? Perhaps both her parents like "Minami-san"? I don't know, MTL is more trying to make sense of stuff than actual translation. Seems to fit, however.) She wakes up to see a face looking more like that of Minami-san face slowly looking like Abazure-san's which is, in fact, her own reflection. And apparently the artistic kid she knows in class is there hands her something that says "Kill You" on it... Which is exactly what we see written on Abazure-san's t-shirt in chapter 1 of the manga. So... Yeah. Not as much of a tragedy as it COULD have been considering the author.