I hate these kinds of endings, not becuase they're bad, but because they fuck me up something fierce. Sometimes for days. The best quick fix remedy for me is to immediately do something else unrelated to anime, but then it inevitably comes crashing back down once I'm lying in bed reflecting on my day and all that I've seen and done. It may be naive, but I wanted Kaori to survive. I wanted her to live, I wanted her to get with Kōsei, and have a good life with the others. Though I really liked Tsubaki, I figured she'd end up with Watari in the end, and then they'd all have their happy ending.
Oh well, this is gonna fuck me up some time to come. I found the ending to be signficantly more emotional than AnoHana, even though that got me pretty good too. I've never cried watching anime, but still, the feels. They really mess me up.