Hazuki is carving her unborn fetus out of herself.

I'll admit Yua's first arc is pretty annoying/boring, though it has some extremely creepy parts (srs gave me the heebie jeebies when she talks in her psycho tone and repeats things tons of times in different phrases *shudders*) and amusing parts. However, Yua's second arc makes her a much more likeable character. She teams up with Ban and Momo and helps them investigate. They let her in on their discovery about GE rates, and that Takumi couldn't have been the New Gen killer, like she suspected. She ends up feeling very remorseful towards Takumi because she truly does like him. Yua and Takumi's final discussion fixes the craziness she caused him earlier. They end on good terms, and she becomes an essential character to the ending (she is one of the giga-lo-maniacs, afterall).

I'll reveal some mysterious characters' true identities/motives:

Shogun: Shogun is the real Takumi. When he was young (10-ish, I think), Takumi's condition began to worsen rapidly to the point where he had to live in a hospital. He has the special ability to bring delusions he creates to reality (called "real-booting"). He's the strongest giga-lo-maniac* in existence. He's the only one that can real-boot delusions without the use of a Di-Sword. He has extremely strong power over delusions. Realizing the danger the world is in (which I'll talk about in a bit), the real Takumi used his immense power to real-boot one last delusion: an alternate version of himself. This real-booted delusion becomes the Takumi that is the main character. Since the real Takumi's powers are so immense, he was able to create this new Takumi as a giga-lo-maniac himself. That is why the main Takumi can see delusions and Di-Swords.

However, by creating this new Takumi, he lessened his life span even farther. Every time the main Takumi creates a delusion, it hurts the real Takumi and shortens his life. If the main Takumi were to obtain his Di-Sword (referred to as "awakening"), it would probably kill the real Takumi due to the immense power. The real Takumi wants his alternate self to awaken, so that he is powerful enough to stop what is about to happen. Rimi, though, does not want him to awaken because she cares for the real Takumi a great deal (not gonna bother explaining why, unless someone is curious). In the end, Rimi goes off to try and stop what is going to happen (again, I'll explain in a bit) by herself, so that the main Takumi doesn't need to awaken. She is unable to, though... Long story short, the main Takumi obtains his Di-Sword (which is EPIC) and realizes what he must do.

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* Giga-lo-maniacs are people that have power over delusions (see and create them). They can see them even when they haven't been real-booted. Giga-lo-maniacs always end up obtaining a Di-Sword when they have to endure an extremely tragic event or prolonged torture/stress. It's only obtained once the giga-lo-maniac truly needs it. Once they have it, they can real-boot it whenever they want to use in reality (though they often choose to just leave it in delusion form). It becomes their strongest ability and their literal savior.

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Hazuki: AKA = DEMON NURSE FROM HELL. She's the true New Gen murderer. Yeah, I'm frickin' serious. She carved her OWN unborn fetus from her womb and sewed it into that STILL living man. Holy frick that was disgusting, especially with the all-too-real sound effects. DANG. She is freakin' psycho. She committed the murders herself. She SCOUPED the BRAINS out of that doctor with a SPOON. I am not kidding. LOL I was like, ......SWEET MERCY! :O!!!!

Oh, and here's the best part: You know Takumi's online friend (that he chats with in IRC and plays Ensue with), Grim? Guess what? THAT'S HAZUKI! Ever wonder why Grim always knows about the New Gen murders like right after they happen? Ever wonder why he always has access to the links before others? CAUSE GRIM IS HAZUKI, AND SHE'S THE ONE COMMITTING THE MURDERS. I nearly crapped myself. If you were paying very close attention in the first chapter, they even foreshadow this. Grim says, "Yeah, the murders have all been happening in your neighborhood. lol" The thing is, Takumi's never told Grim where he lives. Takumi didn't even realize it until later, though. LOL Frickin' craziness.

You'll be happy to know Hazuki ends up gouging her own throat out when Takumi uses his mental powers to reveal to everyone her memories and thoughts of the murders. <3

Suwa: AKA = DEMON DETECTIVE FROM HELL. LOL. I never saw this coming, not from a mile away. DANG. Suwa is secretly working for NOZOMI and ends up revealing his true nature at the end. He shoots Ban to death (;_; ;_; ;_; ;_, shoots and kills Sena's father and uses those same cross daggers (as seen in New Gen murder #3) to pin Takumi to the wall (BEST SCENE EVER). However, when he's just about to kill Takumi, Takumi uses his powers again to switch their bodies. Suwa ends up being the one with all the daggers in him. LOL He bleeds to death pinned to the wall. EPIC.

I CAN NEVER LOOK AT SUWA THE SAME. Everytime he smiles in the anime, I picture his EVIL smirk in the VN. ;_; ;_;

Norose: President of NOZOMI corp. AKA = the true villain of the series. Guess what? He also happens to be one of the strongest giga-lo-maniacs ever! HECK YES. His Di-Sword is a massive scissor-like cross blade (he crucifies Nanami and Rimi on it, even). Norose is using the NOZOMI corp to develop his ultimate machine, the NOAH II. It's a machine that basically has the power of God. He created it by using several "code" samples from giga-lo-maniacs, including Rimi, Yua and Ayase. To make it perfect, he needs a "code" sample from Takumi.

The first time he tested it, the 1st Melt occurred (the small earthquake that killed 8 people before the beginning of the series; it's only mentioned a few times). He tests it again later, causing the 2nd Melt. The 2nd Melt was a much larger earthquake that destroyed all electronic things (wipes all info from all computers in Shibuya) and kills over 300 people. At the end of Chapter 9, he uses it one last time in its near-perfect state and triggers the 3rd Melt. The 3rd Melt was the largest earthquake they have ever experienced. It destroys almost all of Shibuya and kills near 10,000 people (seriously). The NOAH II, if it were to reach its perfect state, would be able to control every single person on the world and rewrite what they see, feel, hear, etc. to anything Norose desires. He'd essentially become God.

The final fight between Norose and Takumi (epic beyond words) takes place in front of the NOAH II and is very, VERY bloody and full of delusions (the NOAH II creates them to defend itself like crazy). Norose is the only one who has control over it. He's raping Takumi silly until Takumi uses Norose himself to destroy the NOAH II (literally throws him into it lol). In the BAD end of Chaos;Head, the NOAH II's destruction causes the complete and total annihilation of everything, leaving only Takumi and Rimi. The BAD end ends with Rimi using her Di-Sword to kill Takumi. :x

This CG is from the insanely epic final fight between Norose and Takumi. There is tragically no good CG of Norose's full Di-Sword, but I will go back to Chapter 10 and get a good picture of it if someone really wants to see it (trust me it's godly).

This CG is from the memory of Hazuki as she is carving her unborn fetus from her very own womb. She takes great pleasure in it and even laughs during the process.

.............yeah.

This CG is from one of the most twisted and EPIC scenes where Suwa is throwing dagger after dagger into Takumi, torturing him and enjoying every moment of it. I can still remember the sound as each dagger pierces Takumi's flesh.

I'm not kidding. I'm talking scenes as gruesome as a mother (Sena's mother) eating her rotting fetus. A mother (Hazuki) gouging her unborn fetus from her very womb. Five people jumping from a building and exploding into a mass of blood and gore so thick, you can't tell them apart. Etc, etc...