Noriko Sonozaki

Noriko Sonozaki (園崎 法子 Sonozaki Noriko) is a central character in Kiznaiver. She is responsible for bringing all of the Kiznaivers together to participate in the experiment. Her birthday is July 10th.

Noriko Sonozaki is voiced by Hibiku Yamamura in Japanese, and by Natasha Strickey in English.

Appearance
Noriko is a beautiful girl with pale skin, long blue hair with a crown braid, and silver eyes.

She is seen wearing an altered school uniform, with an accented blazer and a lightly tinted blue skirt. She also wears white thigh-high socks, and has many frills implemented into her uniform.

She possesses a diamond imprint pattern around her neck in the style of a choker.

Episode Six
Speaking to the seven Kiznaivers through a voice message, Noriko informs the Kiznaivers that they are making good progress and that by that, telling Katsuhira that they were incredibly powerful words. Though she tries not to show it, she is affected emotionally.

Episode Seven
Noriko is seen sitting at her desk, remembering the sentence that Katsuhira had said to her, and pushing away an old photo of her childhood.

Episode Eight
Near the beginning, Noriko is again seen remembering what Katsuhira had said to her and stating that she 'does not understand.' Later, when conducting the next experiment on the Kiznaivers, Yamada constructs a love chart to show the different love interest between the Kiznaivers. Noriko is not surprised and deduces that Katsuhira has romantic feelings for her, stating that she was not aware of this. She then tries to draw out Katsuhira's feelings to continue the experiment, leaving the underground laboratory to reach the surface. Feeling his connection with Noriko, Katsuhira rushes to her location and saves her from a falling statue that would have fallen onto her. Unfazed, Noriko asks if she still exists within Katsuhira, then takes off her choker to reveal that she has a Kizna scar and that she is connected to him.

Episode Nine
Noriko falls unconscious, and when she awakes, she is alone with Katsuhira as the two of them are being recorded. She asks Katsuhira if he loves her, and then asks how often he thinks of her. In response, Katsuhira asks Noriko if the two of them really are connected as Kiznaivers. Noriko confirms this and explains that the two of them were made Kiznaivers when they were just children, and then Katsuhira had simply forgotten about it. Remembering this, Katsuhira's old Kizna scar reappears on his chest and he feels pain as he begins to remember his childhood with her. Worried, Noriko gets close to him and examines his scar, and then notes that the two of them are still connected after so many years. The rest of the Kiznaivers find Noriko and Katsuhira, and Chidori is overwhelmed by jealousy at the sight of the two.

In her sadness, the other Kiznaivers are able to momentarily hear Chidori's inner voice, and Noriko is shocked by this. Even though the Kiznaivers then proceed to go through an emotional breakdown, Noriko comes back during the aftermath and tells everyone that their mission has been cleared and that they do not need to be Kiznaivers any longer.

Episode Ten
As Noriko is again confronted by the Mayor and told that the Kiznaiver experiment must come to an end, Noriko quickly leaves the room and runs to the roof of the building, preparing herself to jump off in order to 'show the results of the Kizna system'. Instead, Noriko falls unconscious before she falls off.

Feeling a sensation of pain from his chest, Katsuhira realizes that something may have happened to Noriko and finds the underground laboratory where she worked with Urushibara.

Mutsumi Urushibara finds Katsuhira and decides to explain more about Noriko while she is still unconscious.

It is revealed that during the Kiznaiver experiment conducted on children, there was a fatal error that caused one child to feel nineteen times the pain than usual, instead of the pain being shared equally. That one child was Noriko. Because she always felt nineteen times the pain than she was meant to and because she could feel every sensation of each child, including sitting and running, Noriko would constantly feel incredible pain. To remedy this, ever since she was a child, Noriko would have to take an injection to nullify all of her senses to keep herself from feeling constant pain.

But due to her body unconsciously taking every other child's pain and never giving it back (because she was suffering from loneliness), the other children lost their ability to feel emotional and physical pain. Some of the children were still able to keep some of their pain, such as Katsuhira, but others no longer felt anything

It is also revealed during a flashback that, during their childhood, Noriko did in fact love Katsuhira.