A trailer featuring a narration by Makise Kurisu, along with shots of the movie (presumably) and flashbacks of the series.

Translation:

“By changing the past, you change the future. That’s something crueler than death. The proof that life and its meaning has all but vanished. I can’t control my memories. ‘Then we can’t. Without you, it’s not worth it!’ I’m a scientist. I have to act on my own theory and basis. I can’t let my emotions sway me. But there’s no way I can forget all of that. Because I’ve known you for so long. So very long. This is reality. This is the world. Okabe…it hurts…”

B.W.