History VisualNovel / ChaosHead

** Sena. She even has a ShoutOut to LightNovel/{{Sha|kuganNoShana}}na.

* BookEnds: [[spoiler: The story starts and ends with Takumi lying in the Scramble Crossing of an earthquake ruined Shibuya with Rimi about to murder him.]]

That being said, a current fan translation by Committee of Zero, a group dedicated to translating Science Adventure content that never came to the west, is currently working on translating the ''Chaos;Head [=NoAH=]'' version of the game as it is the canon entry that future titles rely on story wise.

* AluminumChristmasTrees: The Committee of 300 are actually based off of a [[https://en.wikipedia.org/wiki/Committee_of_300 real life conspiracy theory]].

* ExpandedUniverse: While ''Chaos;Head'' was originally a standalone title, its ''[=NoAH=]'' version retcons a few scenes and adds a lot of new lore and reveals, which combined with the original story set up the foundation for the entire Science Adventure series. Every mainline entry following this story heavily references the events of ''Chaos;Head'' in many different ways, either thematically or in the actual narratives events and how it heavily relies on the science behind ''Chaos;Head'' and its conspiracy to be fully understood. These sequel entries follow the plotline of many different groups of people in Japan's Tokyo Ward who are [[spoiler:targeted by the Committee of 300 and forced to battle this deadly conspiracy group in order to escape with their lives and thwart their plans of ruling the world.]]]]

* ExpandedUniverse: While ''Chaos;Head'' was originally a standalone title, its ''[=NoAH=]'' version retcons a few scenes and adds a lot of new lore and reveals, which combined with the original story set up the foundation for the entire Science Adventure series. Every mainline entry following this story heavily references the events of ''Chaos;Head'' in many different ways, either thematically or in the actual narratives events and how it heavily relies on the science behind ''Chaos;Head'' and its conspiracy to be fully understood. These sequel entries follow the plotline of many different groups of people in Japan's Tokyo Ward who are [[spoiler:targeted by the Committee of 300 and forced to battle this deadly conspiracy group in order to escape with their lives and thwart their plans of ruling the world.]] The series is building up a ''Franchise/MarvelCinematicUniverse'' type of storyline where every cast from each entry will come together in order to [[spoiler:put a stop to the Committee of 300 and free their world from their tyranny once and for all.]]

** The cashier yelling "Bang!" at Ban in Chapter 8 and the kid on the train yelling "Bang!" repeatedly at him in the beginning in Chapter 9, and Yua mentioning [[spoiler:her having a bad feeling about it. Ban gets shot to death ("Bang!") later that chapter.]]

** Unlike future [=SciADV=] games that feature major characters who often closely know other and regularly interact, the cast of ''Chaos;Head'' is far more disjointed, with Takumi being a major social recluse with a negligible inner circle. As a result, the majority of the supporting cast only shows up when the plot requires them to, leaving them significantly underdeveloped in the original release.

** The UpdatedRerelease of ''Chaos;Head Noah'' was developed concurrently with ''VisualNovel/SteinsGate'' and made numerous changes to bring it in line with the latter title, most notably by updated the background and environmental art, and revamping the route system to make it more character-focused, allowing the supporting characters. [[ADayInTheLimelight to have their time in the limelight]]. To date, ''Chaos;Head'' has had the most dramatic changes made to its UpdatedRerelease compared to what's been the case for future [=SciADV=] titles.

** The DiageticInterface is far more prominent in this visual novel, with the game going out of its way to replicate the late 2000's PC interface in the design of its TIPS and Save/Load screens. Later [=SciADV=] releases toned down this aspect significantly, featuring more standardized UIs.

* DarkerAndEdgier: [[spoiler:''Chaos;Head'' was probably the darkest entry in the ''VisualNovel/ScienceAdventure'' series until ''VisualNovel/ChaosChild'' got released, and even then it one-ups its thematic successor in certain aspects. The main protagonist, Takumi, is a mentally disturbed UnreliableNarrator who's an extreme social recluse, the plot is chock-full of ParanoiaFuel with the storyline deliberately confusing you about what's real and what's not, and the driving force behind the plot is a series of incredibly ghastly murders that Takumi gets implicated in. While the true ending is a case of EarnYourHappyEnding, the journey to get there is nothing short of unadulterated PsychologicalHorror.]]

* EarlyInstallmentWeirdness: As the first entry in the ''VisualNovel/ScienceAdventure'' series, ''Chaos;Head'' really shows its age, particularly when it comes to the original PC release:

A fan translation patch for the game exists, but was taken down from the main site due to an agreement with Nitroplus, which unfortunately led to DevelopmentHell as there's no localized version of the game yet, in fact no news after the "agreement" between the original fan translators and Nitroplus were given.

A Main/{{Sequel}}, ''VisualNovel/ChaosChild'', was released for the UsefulNotes/XboxOne in 2014, with different cast of characters in the same setting of Shibuya set several years after the events of ''Chaos;Head''. The [[http://www.crunchyroll.com/chaoschild anime adaptation]] started airing in January 2017. An official English version was released on Steam in January 2019.

In February 2022, the official Twitter account for the Science Adventure series posted a tweet hinting towards an official English release, and shortly after dropped a trailer announcing the first ever official Western release of ''Chaos;Head [=NoAH=]'' to be released on October 7. The game was at first meant to be released on UsefulNotes/{{Steam}} and UsefulNotes/NintendoSwitch, but on September 30, Creator/SpikeChunsoft, the publisher, announced that it had not managed to guarantee a release on Steam because the game had apparently fallen short of Steam's guidelines. Thankfully, on October 6, the decision was reversed, and the game would be released on both platforms as originally planned.

In February 2022, the official Twitter account for the Science Adventure series posted a tweet hinting towards an official English release, and shortly after dropped a trailer announcing the first ever official Western release of ''Chaos;Head [=NoAH=]'' to be released on October 7. The game was at first meant to be released on UsefulNotes/{{Steam}} and UsefulNotes/NintendoSwitch, but on September 30, Creator/SpikeChunsoft, the publisher, announced that it had not managed to guarantee a release on Steam because the game had apparently fallen short of Steam's guidelines. As a result, those interested in buying it would have to turn to the Switch release for now, though Spike Chunsoft are also exploring alternative platforms for the PC veraion.

In February 2022, the official Twitter account for the Science Adventure series posted a tweet hinting towards an official English release, and shortly after dropped a trailer announcing the first ever official Western release of ''Chaos;Head [=NoAH=]'' to be released on October 7. The game was at first meant to be released on UsefulNotes/{{Steam}} and UsefulNotes/NintendoSwitch, but on September 30, Creator/SpikeChunsoft, the publisher, announced that it had not managed to guarantee a release on Steam because the game had apparently fallen short of Steam's guidelines. As a result, those interested in buying it would have to turn to the Switch release instead.

In February 2022, the official Twitter account for the Science Adventure series posted a tweet hinting towards an official English release, and shortly after dropped a trailer announcing the first ever official Western release of the game to be released on October 7. The game was at first meant to be released on UsefulNotes/{{Steam}} and UsefulNotes/NintendoSwitch, but on September 30, Spike Chunsoft announced that it had not managed to guarantee a release on Steam because the game had apparently fallen short of Steam's guidelines. As a result, those interested in buying it would have to turn to the Switch release instead.

In February 2022, the official Twitter account for the Science Adventure series posted a tweet hinting towards an official English release, and shortly after dropped a trailer announcing the first ever official Western release of the game to be released on October 7. The game was at first meant to be released on Steam and UsefulNotes/NintendoSwitch, but on September 30, Spike Chunsoft announced that it had not managed to guarantee a release on Steam because the game had apparently fallen short of Steam's guidelines. As a result, those interested in buying it would have to turn to the Switch release instead.

A Main/{{Sequel}}, ''VisualNovel/ChaosChild'', was released for the UsefulNotes/XboxOne in 2014, with different cast of characters in the same setting of Shibuya set several years after the events of ''Chaos;Head''. The [[http://www.crunchyroll.com/chaoschild anime adaptation]] started airing in January 2017. An official English version was released on UsefulNotes/{{Steam}} in January 2019.

In February 2022, the official twitter account for the Science Adventure series posted a tweet hinting towards an official English release, and shortly after dropped a trailer announcing the first ever official Western release of the game to be released in October.

The [[AnimeOfTheGame game was made into an anime]] by Creator/{{Madhouse}} for the fall 2008 season, with an Xbox 360 enhanced remake titled ''Chaos;Head [=NoAH=]'' released in February 2009. The ''[=NoAH=]'' version is essentially a DirectorsCut version of the original version, featuring several graphical enhancements, and some changes to the script, including additons of several new scenes -- most prominently in the form of fully-fleged routes for the different heroines, and though many focused on fleshing out the characters, they also provides extra details to the plot.

The [[AnimeOfTheGame game was made into an anime]] by Creator/{{Madhouse}} for the fall 2008 season, with an Xbox 360 updated rerelease titled ''Chaos;Head [=NoAH=]'' released in February 2009.

* YankTheGodsChain: Hatano experiences this when [[spoiler: his baby daughter, Mana, dies for unknown reasons while he is taking care of her. This also happens in the middle of the experiment on his wife. He grieves, but ultimately fights to keep his wife in the experiment to prevent her from having to grieve for Mana and acknowledge her death. This lasts for 2 years until the plug on the experiment is pulled. His wife commits suicide and his last remaining daughter is dragged off to a psychiatric ward by NOZOMI, losing him his entire family in one fell swoop.]]

* HospitalHottie: Shino. Also a {{Meganekko}}, to an extent.

* {{Meganekko}}: Yua, [[spoiler: [[NotHimself most]] [[ScaryShinyGlasses of the]] [[DepartmentOfRedundancyDepartment time]]]].

* AdultFear: Hatano experiences this when [[spoiler: his baby daughter, Mana, dies for unknown reasons while he is taking care of her. This also happens in the middle of the experiment on his wife. He grieves, but ultimately fights to keep his wife in the experiment to prevent her from having to grieve for Mana and acknowledge her death. This lasts for 2 years until the plug on the experiment is pulled. His wife commits suicide and his last remaining daughter is dragged off to a psychiatric ward by NOZOMI, losing him his entire family in one fell swoop.]]