Asking stupid imgflip users is my last resort.

Clannad

Now I'm not one to judge. But it does not looks like it would be realistic at all. I maybe should have mentioned the art style as well. Because all the people in the photos I have seen have colorful hair.

Ohhhhh, Classroom of the elite

Hate to seem picky, but it's also not really my style.

I'm kind of looking for something a bit on the depressing side. Maybe darker colors, nothing fantastical. Look at Terror in Resonance for instance. That's kind of what I'm going for.

Mehhh realistic and depression is quite hard but ik some

Oyasumi Punpun (goodnight punpun) - This one can literally make you depressed, it's very realistic and very sad.

-Rainbow - it has a lot of hope throughout, but to be hopeful it has to have some very low points.

-Monster - A doctor saves the life of a boy who becomes a serial killer, the doctor drops everything to try to fix his mistakes

-Chi no Wadachi (Blood on the Tracks)

-Inside Mari (Involves Body Swap on the beginning, but really is grounded in reality)

Depressing, but with supernatural stuff (not strictly fantasy):

-Blade of the Immortal

-Gantz (blood, gore, nudity, but also a pretty heavy story. It gets MUCH better as the story continues)

-Inuyashiki (same author as Gantz) - This has some VERY heavy stuff, read at your own risk.

-I am a hero (zombie apocalypse, but everything else is realistic)

-Shiga Hime (brutal look at mistakes made in adolescence)

-Happiness (involves vampires, but really is grounded in realism)

Supernatural:

-Berserk - Some consider this to be the best manga of all time

-Blame! - Very little dialogue, but it's a very bleak story

-Uzumaki - Think japanes Lovecraft

-Gyo - This does not end well

-Terra ForMars (I personally don't like this one, it's also a bit racist) - What if roaches hyper evolved on mars

-Parasyte (debatable whether you'll fund it depressing) - What if aliens invaded earth by taking over your neighbors

Some of those seem pretty interesting. I have heard a lot of good things about Berserk, but I'm purposefully avoiding it for a few reasons. (Not because of rape shit)

I'm probably going to start with Rainbow, because if it's the same one you are talking about, it seems pretty interesting.

Monster also highly recommended

Ive seen a couple clips and chainsaw man looks pretty realistic. Much better animation quality than what I usually watch

You should watch it too

I plan on giving it a try soon

CSM is really good. But it's fantasy. I'm looking for one that is literally realistic. A silent voice is a good one that has very real feeling settings and all of that. But i have watched it probably over ten times.