Genres: Harem, Mystery, Psychological, Sci-Fi, Supernatural

Age range: I want to say between 16 to 17+ but I'm not 100% sure.

Chaos;Head  (stylized as "ChäoS;HEAd") is a visual novel video game developed by 5pb. and Nitroplus. It is the first entry in the Science Adventure series, and was originally released for Microsoft Windows in 2008; an enhanced version titled Chaos;Head Noah was released for Xbox 360 in 2009, and has since been ported to multiple platforms. The game follows Takumi Nishijo, who gets caught up in the "New Gen" serial murders. He frequently experiences delusions and hallucinations; the player can use the "delusional trigger" system to decide whether he should experience positive or negative delusions, which determines the story's ending.

The game was planned by Chiyomaru Shikura and written by Naotaka Hayashi, and features character designs by Mutsumi Sasaki and music by Takeshi Abo and Zizz Studio. Abo read through the game's story before composing the music, a process that took a longer time but made it possible to compose with a better relationship to the game's worldview. Gaming publications have complimented the game's story, and wished for an English release. The game was a success, helping 5pb. establish itself as a game developer. In addition to the game, three manga, an anime series and an internet radio based on Chaos;Head have been released, as well as the side game Chaos;Head Love Chu Chu! and the thematic sequel Chaos;Child

Game plot:
    The game is set in 2009 in the Shibuya district of Tokyo, where Takumi lives in a cargo crate on top of an apartment building.[1] He discusses the recent series of "New Generation Madness" ("New Gen") murders in Shibuya with his online friend Grim, when a person with the username "Shogun" sends Takumi image files depicting a man pinned to a wall with stakes. Later, Takumi witnesses a pink-haired girl committing the murder portrayed in Shogun's image files; he leaves the murder scene in fear. A few days later, the girl, whose name is Rimi Sakihata, sits next to Takumi in school; he thinks she will kill him, but learns that they supposedly have been friends for a year.

Convinced that Shogun is targeting him, he tries to distance himself from having witnessed the murder scene and avoid getting involved in New Gen, which draws the attention of the police. Between him being suspected, more New Gen murders occurring, and Shogun supposedly targeting him, Takumi finds himself experiencing hallucinations and paranoia, and is unsure of what is real and who he can trust. In one of his delusions, Shogun appears as an old man in a wheelchair and tells him that more people will die unless he wakes up.

Takumi sees a girl carrying a large sword in public, and notices that only he can see it. Ayase Kishimoto, who recently transferred to Takumi's school, tells him that he needs a "Di-Sword" to be saved. She pulls her Di-Sword out of thin air and tells him that Di-Swords are delusions projected onto people's minds by people with special powers. He learns that the girl carrying the sword – Sena Aoi – and her friend Kozue Orihara also can project delusions, and that such people are called "gigalomaniacs". He is told that he, too, is a gigalomaniac, and that gigalomaniacs can project delusions into reality, which is called "real-booting".

The Nozomi Group in Shibuya is revealed to be using their Noah II machine to synthetically use gigalomaniac power for their own gain; to do this, they have people carrying transmitters to increase Noah II's signal reach. When a Noah II-created delusion causes people to panic, Sena and Kozue destroy nearby transmitters, and Takumi, Sena and Kozue join forces to stop Nozomi. They infiltrate Nozomi's headquarters and reach an underground research facility where they find Noah II and Genichi Norose, the president of Nozomi, who tries to stop them; they defeat him and destroy the machine, but it is revealed that the machine was just a prototype and not the actual Noah II, and that the Norose they fought was a real-booted delusion projected by the machine.

Takumi learns that he is an artificial, delusional clone with fabricated memories, created by Shogun – the real Takumi. His sister Nanami is being held in the location of the real Noah II, where she is made to awaken as a gigalomaniac and obtain a Di-Sword. Rimi – also a gigalomaniac – tries to save her, but is attacked by Norose and is taken prisoner in Nanami's stead. Shogun again meets with Takumi to tell him that he had intended to stop Nozomi from taking over humanity with Noah II, but that his body – aged from disease and overuse of gigalomaniac powers – hindered him, prompting him to create Takumi to do it in his stead. Takumi obtains a Di-Sword, and destroys the transmitters, revealing the nurse Hazuki to be the New Gen killer in the process by reading her memories and projecting them onto the screens on the buildings. An earthquake occurs, destroying much of Shibuya; Takumi rescues the other gigalomaniacs from the destruction, and continues to the location of Noah II. He fights Norose, but Noah II activates its self-defense mode, overwhelming Takumi with delusions; he reaffirms his existence, and destroys Norose and Noah II with his Di-Sword. As he lies in the ruins of Shibuya, depending on what delusions the player has chosen, he either gives up his life along with the dying Shogun's, or stays alive with Rimi.

Anime plot:

   Shibuya, Japan, 2008. Takumi Nishijou, a high school student at the Private Suimei Academy, one day hears about the 'New Gen' murders that have been occurring around the city. Although dismissing the subject because it doesn't involve him, Takumi begins to experience strange mishaps around him, from a horrific picture he received while on his PC, to a mysterious Pink-Haired girl standing at a murder scene.

From there on Takumi struggles to cope with the events unfolding around him, and is soon unaware of what is real or a delusion. As his fate opens up before him, the perpetrator behind the 'New Gen' events attempts to find him, leading him into a world where nothing is as it seems.

Review:
Alright boys & girls, this anime is also one I watch during middle school, I don't remember much about it but I did know it had bunch of wtf moments.