|Also known as|| Zaki (by friends)|
Zaki-chan (by Makoto and Nagisa)
Yazaki-san (by Rin)
|Occupation||Elementary School Student (High☆Speed!)|
|Affiliation|| Iwatobi Elementary School (former)|
Iwatobi Swimming Club (former)
|Relatives||Shota Yazaki (brother)|
|Light Novel||Chapter 2|
Aki Yazaki (矢崎 亜紀 Yazaki Aki) is one of the characters in the light novel High☆Speed！ written by Kouji Ohji and was one of Haruka, Makoto, and Rin's classmates from elementary school. She was also in the same swim club, Iwatobi Swimming Club, as Haruka, Makoto, Rin, and Nagisa.
Aki's physical appearance is never mentioned in the light novel. However she is mentioned to always be wearing a white muffler that is later stained brown when it accidentally falls into a river.
In the manga, she's shown to have a short bob haircut with a small braid running down part of it on one side.
Aki is a kind and sweet girl who always seems to have a "sunflower" smile. Because of her cheery disposition she always sees the silver lining in any situation.
She is also someone who values the relationships she has such as wanting Haru to depend on people and make friends, referring to her relay team as her sisters, and crying at her and the boys' elementary graduation ceremony.
Even in stressful situations she can keep a clear head and take charge such as when Haru almost drowns in the river, she is able to call the ambulance, swim club, and Haru's mother while Rin and Makoto rescue him.
In the same competition where the boys won first place in their relay, Aki and her friends won bronze in the girls relay.
Haruka Nanase - Aki regards Haru highly, and she and her lost scarf in the river beneath Misagozaki Bridge are a major catalyst for his development. She puts in effort to understand his viewpoint, mentioning that she would have continued staring on glumly as her scarf floated away if he hadn't told her to leave it be. Because of Haru being attentive to her, Rin thinks that out of everyone, it's more likely that she, along with Makoto, can get through to Haru about joining him in the medley. She, like Rin, believes that Haru would do well swimming in the medley, wanting to see Haru rely on others.
Makoto Tachibana - Aki and Makoto have a good relationship, with the latter affectionately calling her 'Zaki-chan,' much like he would later call Rin's sister and Iwatobi's manager 'Gou-chan.' Aki turns to him to understand Haruka more than she does, and Makoto is supportive of her as a friend, such as when she loses her scarf, and when she forwards the idea of planting flowers around a lonesome cherry blossom tree. Late in High Speed! they share excitement over each other's medley team doing well, culminating in a high five between the two of them.
Nagisa Hazuki - From the beginning, Nagisa calls Aki "Zaki-chan" affectionately, much like he later calls Gou "Gou-chan." Aki regards Nagisa as a little brother, but becomes taken aback by his large eyes, thinking that their gaze lays bare the swimmer she truly wants to be. She's shown to yearn "to swim with [her] honest feelings, like Nagisa does," and hates herself for being unable to answer him with certainty.
Rin Matsuoka - Unlike Makoto and Nagisa, Rin calls Aki "Yazaki-san." At one point she's led to believe, due to their joking around, that Rin is being bullied by the boys and promptly scolds them. She connects with him through how much they both want Haru to join the medley, confirming during their conversation that she thinks of Rin as someone with a large personality. In her mind, she wonders how he's always "running towards somewhere," seeking something.
Shota Yazaki - Aki admires her older brother, as his being part of the swim club is the initial reason she also joins. However, she also displays annoyance and disappointment in her brother as when her brother gets upset after losing a race to Haru and getting banned from club activities. She calls him stupid and impatient for it, stating that he always orders people around and acts all self-important.
- Despite what the anime shows, Aki is actually the one who came up with the sentence, 'I swim best free for the team' on the school bricks, according to light novel.
- Although she plays an important part in the light novel and manga, Aki never makes an actual appearance in the anime.