I`m ashamed to say, but I`ve never read any manga of the anime I loved... It`s like I`m afraid I could ruin the amazingness of what I`ve just seen. Hearing what you said though, I think in this case it`s quite a good choice. Dark I can handle, but depressing, not really.
My memory now is of an amazing anime, that hurts quite a lot, but still allows for positivity. I`m a softy I guess, but I don`t want to lose Rico, Reg or Nanachi either, heck, come to think of it, not anyone actually. All characters were so loveable.