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These series all _seem_ to be connected, but asides from sharing the same
production company and having the semi-colon separate their titles I can't see
any relation between them. The plots seem to be completely disjoint.

![best girls?](https://i.stack.imgur.com/mHBIb.jpg)

When I was looking up Chaos;Head and Stein's;Gate, I also found
Robotics;Notes, but it too seems to not be connected. Can anyone explain the
connection between these series for me?


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steins-gate robotics-notes chaos-head
How are Chaos;Head, Steins;Gate, and Robotics;Notes connected?


Steins;Gate, Chaos;Head, and Robotics;Notes all take place within the same
universe but at different times.

There are also multiple Steins;Gate references in Chaos;Head, and there are
multiple Steins;Gate references in Robotics;Notes.

These could be just for comedy purposes or they could be hinting at a
relationship. Robotics;Notes also takes place in the Steins;Gate Divergence
Ratio 1.048596.

Other than that the Visual Novels of all three were created by 5pd and
Nitroplus.


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answer


_Chaos;Head_ and _Steins;Gate_ exist in the same ("Science Adventure")
universe, but on different world lines.

  * _Chaos;Head_ happens in [Shibuya](http://en.wikipedia.org/wiki/Shibuya) and the events happen one year before _Steins;Gate_
  * _Steins;Gate_ happens in [Akihabara](http://en.wikipedia.org/wiki/Akihabara)
  * _Robotic;Notes_ happens in [Tanegashima](http://en.wikipedia.org/wiki/Tanegashima) Island and the events happen nine years after _Steins;Gate_

The events of _Chaos;Head_ are consistent with the events of _Steins;Gate_
within the Beta worldline, divergence ratio: 1.130426%. _Steins;Gate_ and
_Robotics;Note_ exist on the "Steins;Gate" worldline, divergence ratio:
1.048596%. ( _Steins;Gate_ was also originally in the same worldline as
_Chaos;Head_ , which changed after Okabe sent the first D-Mail and passed to
another worldline.)

There is a mention of "Knight Hart" which is the online persona of
_Chaos;Head_ 's protagonist Nishijou Takumi, in episode 4 of _Steins;Gate_. In
the _Steins;Gate_ game, it's [mentioned that this
character](https://i.stack.imgur.com/BRHYi.jpg) was also looking for the IBN
5100 (the non-conical 8-bit version of the game gets more in depth into his
motvations).

Kurisu explained the "Time Leap Machine" concept to Okabe using NOZOMI papers
from _Chaos;Head_.

On big TV outdoors, FES's performance can be seen in the Alpha timeline.
Giving the right reply to Faris's mail earns the player Ayase's portrait and
FES's music, sung by Kanako Itou, which include the _Chaos;Head_ OP, "Find the
Blue."

There's a Seira-tan cosplay cameo in _Steins;Gate_ as well:

![Kururururururrururururururusu-tina!](https://i.stack.imgur.com/Owtx5.jpg)

_Robotics;Note_ connects the two series a bit more by revealing that the
"Committee of 300" are the driving force between the major events of all three
series.

> [!["Committee of 300" Relationship
> chart](https://i.stack.imgur.com/1qtPJ.jpg)](https://i.stack.imgur.com/1qtPJ.jpg)

Nae from _Steins;Gate_ appears as an adult in _Robotics;Note_. Daru and Kurisu
show up on the Twipo network in _Robotics;Note_ as "DaSH". In the VN game,
Kurisu [uses a
tripcode](https://web.archive.org/web/20150321204741/http://ibm5100.net/steinswiki/2011/09/09/heroine-
qgate/). In the anime, Kurisu posts in @channel under the handle
"[KURI_KAME](http://steins-
gate.wikia.com/wiki/Episode_Glossary#Term_2:_KuriGohan_and_Kamehameha)" in
episode 15 (about 2D and 3D limitations).

> Daru writes the program that eradicates Kimijima Kou from Iru-o.

SERN (and their projects) is also mentioned several times in both
_Steins;Gate_ and _Robotics;Note_


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answer


The phrase "Whose eyes are those eyes?" appears in both Robotics;Notes and
Chaos;Head. In the first episode of Robotics;Notes you can hear Airi say it.
It's the same phrase Nishijo Takumi repeats almost every episode in
Chaos;Head, because he feels like someone is observing him. It's also one of
Kishimoto Ayase's songs in Chaos;Head.


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