I was under the impression Fuyuki did not know that his wish would kill Yumei. Which, is what made it rather bittersweet. I suppose it's up to interpretation, though.

I never really got too emotional with any of the Einherjar's deaths, especially ones like Lawfer, which really were not shown.

The one that hit me the hardest was Celia, whose experience paralleled the lesson that Lenneth learns: that those who really suffer are they who remain.

If we're picking a death, however, I would probably say that Janus' hit me the hardest. The fellow who does everything to garner the love and respect of his parents, is disgraced unfairly (Though that's up for discussion), and is killed after attempting to redeem himself. He didn't have a flashy death or anything, but the statement that was made was pretty sad.

Grey's whole story was pretty sad, too, but that's a discussion for another day.