I want to recommend that in addition to the tragedy tag there should also be one for suicide or suicidal tendency if appropriate, because I know that suddenly being confronted with this topic can be very disturbing, especially if one has experienced the loss of a loved person, or even is or was suicidal her or himself. Sure, setting up tags like that, are always spoilers, but tags like beach, onsen or valentine are as well.
I'm just saying. When I read Come Rain or Shine it was really killing the mood, and I thought: not this again! Yes, unfortunately it's not a singular occurrence. This topic appears every once in a while, be it in Manga, Anime or novels. And the only tag that gives a hint about it is tragedy, which doesn't mean that suicide will appear but could.