It's not really depressing though, in the end there was hope. Just imagine visits and talks once Tsubame has time to figure out why Saori's touches always upset her. It's clear that Saori is head over heels, Tsubame just has to grow up a little to understand more. ^.^
These nice things have a certain way of not happening, unfortunately. Two people are sure they'll see each other again, but all it takes is for one party to fail to communicate a single time, for a relationship to evaporate.
"Sometimes a dream is just a dream, it feels so real for so long, and then, in an instant, it's gone."