Madoka.

Even after all these years and rewatches, it can still draw me in. And Magia still sends chills up my spine.

Serial Experiments Lain.

I was rewatching a couple of episodes and I had forgotten how eerie and creepy this one was.

Orb: On the Movements of the Earth - half of the episodes are so fucking dark that you literally can't see shit

Wierd pick, but Dorohedoro.

The world and main plot are undeniably dark. But at the same time side threads and charachters have a juxtaposed wholesome and positive outlook, and tonally things work like a slice of life a lot of the time.

It's great.

Takopi's Original Sin

• Dusk Maiden of Amnesia
• Vivy
• God Eater
• Gunslinger Girls
• Noir
• Area 88
• Ergo Proxy
• NieR:Automata Ver1.1a

Since nobody mentioned it yet: The Promised Neverland

It started with a very strong hook, had a middle section full of suspense, and ended the best way I could hope for.

Mirai Nikki Elfen Lied Psycho pass

Top three because I couldn't pick a favourite from them if I tried.

Now and Then, Here and There

Psycho Pass is good though it’s not SUPER dark. Very dystopian though. Good show.

Vinland Saga

• Made in Abyss
• Shibou Yuugi de Meshi wo Kuu
• Needy Girl Overdose

Talentless nana

I'd say Death Parade, Fate/Zero, Fate/Stay Night Heavens Feel, Garden of Sinners and Phantom: Requiem For A Phantom

Berserk, Promised Neverland, Redo of Healer.

there's more but I can't remember their names.

Psycho Pass season 1

Probably Akame ga Kill for me.

The bus crash arc in The Fruit of Grisaia.

Besides what was said here, Jin Roh was great: a very adult tale in a very well built and believable world.

Sadly it becomes mudled by the tipical strongman political strife from the 80s/90s Japanese drama. But the way military service and trauma is represented is outstanding.

Perfect Blue is also perfect, and blue.

Wolf Children will wreck you, though I guess it isn't really dark but very recommendable.

Also Berserk but only the first season (golden era).