That's what makes it so awesome.

I think ther are always tragic stories behind them. "it's filled with tragc"

Other ones I consider:
"(dark) fantasy"? ...there you have some horror elements o.O
"Phycholgical". Hehe I was doing a quick rewatch to the movie..."how would I describe the movie (compared to the series)?" I came up with up "more Phychological elements"
"Yuri". When I just sat and tried to make some "reflexions"... I thought "hey, this story, indirectly, somehow, led to somekind of yuri story" haha


..But yeah, in more general terms, I could go with "A little bit of all/most of them I think"