Gore, good story, realism and tragedy?

I'd say this season's RAINBOW Nisha Rokubou no Shichinin pretty much fill that slot.

It's more like realistic depiction of violence than gore, so I'm sure when/if bloody scenes show up, I'm sure the blood will be in realistic quantities. At this point, "tragedy" may be a bit strong a word, but it's certainly a bit depressing, and rather dramatic.

I'd tell anyone to give this a go actually, but I think it fits your requirements rather well.