While shopping for items for the Spirit’s dinner, Shido found Nia collapsed on the street from overwork and hunger. Wondering what to do, Shido agreed to help her back to home. Throughout the way back, she used a lot of dirty jokes and flirty provocation to fluster Shido. After arriving at Nia’s apartment, she requested in an exhausted tone for Shido to cook something for her. Reluctantly, Shido decided to use some of the supplies he bought to cook a rice soup dish that eventually helped Nia regain some of her energy. Afterwards, she swayed Shido into helping her with the erasing and inking of her manga script.
Just as Shido was about to leave, Nia revealed to a shocked Shido that she knows about his goal to make the Spirits fall for him. In an amused tone, she told him that she was a spirit that had been captured by DEM and how she can acquire any information that she wanted to look for. While using her Angel, she explained to Shido that Ellen was able to defeat her through an unexpected ambush, since she has to be actively thinking about the topic in order to use . Feeling that Shido is underestimating ’s power, she showed him its ability to alter the future for a small increment of time. She then told Shido that he was the one who shot down the DEM plane that had escorted her. Nia also revealed to him that she had used to learn about him and set up their meeting as she was grateful to him. As a way of thanking Shido, she agrees to a date with him on the condition that it is in Akihabara.
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Nia and Shido head to Akiba
During the date, Nia and Shido went to a cosplay store where she wore a nurse costume as a fan service reward for Shido. Afterwards, they went to a manga bookstore where she bought all of her favorite manga volumes that she missed during her captivity in DEM. However, even if the date progressed smoothly, Nia’s affection level still remained constant. It was then that she announced her inability to love anything else other than 2D. As a result, Kotori gave Shido the command to cosplay as Nia’s favorite character, Tokiya. While at first amazed that her favorite character had entered the 3D world, she saw through the ruse after seeing Shido act out of character for Tokiya. Eventually, she was angered by his actions and kicked him away.
After returning to her apartment alone, she felt some regret for her actions and remarked that she should have behaved better since she is older than him. However, she also made a comment that even if she let him kiss her; the spirit power would remain unsealed since it would be impossible for her to open her heart to him. Before she could finish her thoughts, she received a mysterious package that contained a game that had Shido as a game character, which Ratatoskr intended to use to make her fall for him. While being satisfied with the game, she decided to use to find other works the company had made, unintentionally discovering Ratatoskr’s intentions and relighting her anger towards Shido.
As the spirits made a plan to write Shido’s story into a manga, Nia used to hack into Ratatoskr’s connection system. Then, she voices her desire that she would not even read their work, partly out of anger towards Shido and partly because of her busy schedule as a manga artist. However, Kotori then decided to challenge her to sales battle at Comico. If they won, she would have to read their work. Unimpressed that they think they can defeat a professional manga artist, she agreed to the challenge.
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Nia and Shido compete for sales
Afterwards, Nia remarks on why she loves 2D. The omniscient angel, , made her distrust everyone, since it allowed her to see the dark side of humanity. It told her how people would talk behind her back and lie to her. 2D was her only refuge that helped her escape from that. The characters could still be complex, yet they could not betray her. She also made a remark about her past, remembering the time when she used to answer how she was born as a Spirit.
Soon after, Nia was approached by Kurumi. She used to scan Kurumi’s background and discovered that Kurumi was the reason the transport plane lacked an escort. Knowing that her powers would be unable to defeat her, she decided to approach the situation cautiously. Although Kurumi was able to collect information easily, still had some secrets that she didn’t know and Nia already knew all of her abilities. However, Kurumi responded that she wasn’t here to be her enemy since she was only here to inquire information about the First Spirit, much to Nia’s shock.
As the sales battle began, Nia and Shido exchange pleasantries, and as custom dictated, exchanged each other’s works. However, Nia remarked that she wouldn’t even consider reading it unless they somehow managed to beat her. As the battle began, Nia had the advantage since her name as pro attracted a great deal of fans. However, Ratatoskr’s side managed to have a comeback by dressing the Spirits in bunny outfits to promote their work. Eventually, the battle ended in a tie and Nia agreed to read their work after accepting her defeat. While initially unimpressed, she was curious on how they managed to complete the work within only 2 days.
As she used to find out the reason, she saw how each spirit started out distrustful like her, but still gradually get immersed in Shido’s light and through him found acceptance in the world. The spirits story about how they changed themselves after meeting Shido brought Nia to her tears and decided that she would give Shido a second chance date. However, at that moment, Westcott released the Realizer he had installed in Nia’s brain, forcing her to remember all the torture she endured when she was still in DEM. Unable to handle the shift from hope to despair, Nia began to go inverse.
Nia was unable to control her actions and summoned her Demon King, , to unleash a swarm of shadow creatures from the it’s scattered pages. While the Yamai sisters, Miku and Tohka were busy fighting Ellen, Nia used ’s ability to manipulate the future to redirect Natsumi, Origami, and Yoshino’s angels against their owners. As everyone became restrained, Shido had awoken the powers that he had started getting a feeling for by remembering the time he went berserk during the beginning of the month. He attempted to awaken Nia’s consciousness by using 's ability. While it seemed to have an effect, Artemisia came out of the shadows and stabbed Nia with her sword. She was also able to use her territory to extract Nia’s Qlipha Crystal through unknown means. The crystal was then absorbed into Westcott, who stole Nia’s ability to use .
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Nia inversing
Westcott, however, decided to retreat after he had Nia's Qlipha in possession and also because he wanted to have the fun for later. The crystal extraction left Nia at the brink of death but fortunately, Tohka noticed that Nia still had some spirit powers left. Kotori noted that it was because the extraction wasn’t complete since Shido was able to awaken some of her consciousness beforehand. It was then Shido decided to seal Nia, hoping that the cycle of Spirit Power between him and the other spirits would heal her. The endeavor was a success, and Nia slowly thanked Shido before closing her eyes again.
Afterwards, Nia underwent a treatment using a medical Realizer in order to stabilize her condition. Even though she was already awake, she was still recovering and had to remain in a wheelchair. Shido decided to take everyone outside in order to see the first sunrise of the New Year. During the ensuing conversation, Nia revealed that she had been a Spirit for almost 30 years and questioned other spirits about when did they became one. Kotori told her about when did she became one along with Miku and Origami's and added that the rest were pure spirits. Nia then responded in a questioning tone by saying that every Spirit used to be human, shocking everyone present.