Muse joins mun in musing on the ending... canon is "Another". Beware, spoilers in post and comments.

[deathfollowshim]

... so, it's over now, isn't it...?

[There's a sigh. Kouichi relaxes a little, a small frown on his face.]

I wish things didn't have to play out the way they did, though.

[Too bad, indeed. Then a quiet laugh.]

... you say you're gonna end up forgetting too, mun? Guess that makes three of us...

Don't look at me, I don't know what you're going to do now that it's over, either. I guess... move on? It's all we can do at this point in time, anyway...

[A pause. Then an almost quiet sigh of resignation as he closes his eyes, looking down. In between his thoughts, what he says almost seem like an afterthought.]

... goodbye, Reiko. And... I'm sorry, Akazawa...