I wasn't really sure where to put this at first, but I ended up deciding on this thread. With the next episode of the anime being a title call, I got to wondering if they might run the OP as an ending song next week (similar to what they did at the end of Episode 15 in the first season). Usually the lyrics of the opening song are particularly well-suited to this sort of "title call" (and it was particularly potent in Episode 15 of Season 1), and so that's why I'm putting it under "Spoilers & Speculation" (since I think the lyrics will probably mean more to people familiar with the novel content).
And so, with that in mind, I started asking myself what the lyrics were to the full song... and decided to try my hand at it. (I tried to use a bit of poetic license where it made sense, without (intentionally) changing the meaning. The bridge was also a killer due to the way the lines were split -- I think I figured out the linkages after many reads/listens...)
reunion
Anyway, my personal conclusion after reading all the lyrics...