A high school girl who is best friends with Haruka, agreeing to help her get closer to Tomonaga. A secret child prodigy that doesn't get many opportunities to test and branch out her knowledge, she displays great interest in Tomonaga's research materials, showing no hesitation to get her hands on books in order to expand her knowledge and learn new things, even if they're in a different language. She hides this aspect of herself, however, holding back in her academics, content with receiving normal grades so long as no one (besides Tomonaga) finds out how smart she really is.
It's been revealed that she hides the fact that she's a child prodigy because she's afraid of being hurt by being treated differently from her peers. Unlike Tomonaga whose genius was embraced and supported, Aoi was victimized, regarded as too smart for her own good and even seen as a cheater by her teachers and Mother, resulting in Aoi restraining herself when it comes to academics. She feels that no one would ever accept her for who she truly is if her true intellect came to light.
It has also been implied that her family circumstances aren't the greatest, arguably even abusive, to the point where Aoi herself has stated that she's used to being physically harmed when trying to stop her parents from fighting with one another. She shares this estrangement with Touka, who is unable to get along with her family albeit for an entirely different set of circumstances. Nevertheless, Aoi is the only one who is able to get through Touka when she's being unreasonable as she is the only one that truly understands Touka's circumstances.
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