I wrote a bit of a fic (not published though) about how Yuri wakes up in a reincarnated life where everyone from the SSS is chilling and knows each other, almost exactly the same as where they were before. Then Yuri sees her dead siblings and realizes that they all finally got into heaven
lol i thought of something similar ^ instead i thought of at the end when you see kanade walking as well as yuzuru, i thought of yuzuru having all of his memories and getting together the sss. then he explains to them what happened and they form the sss so they can help people experience the things they want out of life so they won't have to go to that world that they ended up in.