Wolf Guy/Nightmare Fuel

Akiko Aoshika's entire kidnapping, imprisonment, and gang rape which was all orchestrated by Haguro just to piss Inugami off, since she's his Morality Chain. What makes it even worse is that Haguro not only has his goons gang rape her after he just got through raping her himself, but had poor Aoshika pumped full of drugs that made her loopy and act as if she enjoyed being savagely raped in every way possible in front of a camera, where he would then go onto releasing the video on the internet, just to make extra sure that her life would be ruined forever. Oh yeah. And Inugami was Forced to Watch all of this happen via video, helplessly, reducing the normally Tall, Dark and Snarky werewolf into a complete sobbing wreck... And it goes on... and on... and on and on and on and ON and ON ON ON ON ON DAMN NEAR TWENTY CHAPTERS LONG!!! It really makes you wonder that when compared to other seinen series like Berserk - which is pure, unrefined high octane nightmare fuel in itself - Berserk would turn to Wolf Guy and say, "Whoa! Too far!" Let that sit for a second: an overblown rape scene that is possibly worse than Berserk's. It's just that horrible to read through.
- Also, when Aoshika is holding an unconscious Inugami when Haguro's men come in only to find him dead, demanding an explanation. When Aoshika tries to persuade her way through, they threaten to rape her to death in front of Inugami.
- Post Aoshika's release from her chains and during Inugami vs. Haguro' battle, Haguro gets to slice two of Inugami's fingers, and he eats them in an insane attempt to confirm Haguro is a superior beast to Inugami. He even gets a boner. Ugh.
  - It gets even worse when Haguro slices off four more of Inugami's fingers - and an entire arm!!
Chiba getting his tongue bitten out by Haguro after he kisses him, getting beat up, and then raped for good measure. All because Inugami happened to run into him in the street earlier. He pretty much dies from that but then comes back to life because Inugami gave him some of his blood. There's also his One-Winged Angel form after he comes back to life and how Haguro kills him by cutting off his head.
Konuma Ryuuko. She's a nymphomaniac middle-schooler with what appears to be profound psychological damage from repeated rapes in her past, which made her a nihilistic sociopath.
Kuroda takes a break from blowing up stuff (and students) to try to rape a poor girl with his gun. She even wets herself from fear. Fortunately, Inugami interrupts him.
Haguro and Ryuuko are Nightmare Fuel coated Squick in and of themselves.
- They have a habit of pulling some very unsettling nightmare faces. Haguro's is damn near demonic.
Haguro punishes a mook who seriously failed him by taking away his finger like the Yakuza rules demand... but rather than using something sharp, he uses a metal ring he is wearing, grinding the mook's finger against the floor until it comes off.
Haguro initially doesn't care about or even think twice about Inugami... until he pushes Inugami too far. Which results in Inugami showing him his true form and scaring the shit out of Haguro. Haguro goes insane from it, and obsesses and stalks Inugami after that, even cutting himself all over his arm and carving the word "Inu" onto his hand. And yes, it's creepy to the point of being something of a sexual obsession as well - Haguro has been shown after that to, while having sex with his (equally crazy) girlfriend (who, by the way, also lusts after Inugami and thinks about him while having sex with Haguro), think only about Inugami, and pretty much screams his name while imagining him.