Aki Hiyami

"No messing with our Tsuji!"

- Aki Hiyami to Kirie Konami and Shiori Usami

Aki Hiyami is the Operator of Ninomiya Unit.

Appearance
Hiyami is a light-skinned young woman with round, blue eyes and chin-length, platinum blonde hair styled in a bob cut and bangs. In her trion body she wears the standard Operator uniform. She has been seen wearing a light-colored, long-sleeved shirt under a black jacket, high-waisted, wide-leg trousers (or a skirt) and black boots.

Personality
Hiyami used to be introverted and prone to nervousness, which caused her to keep others at a distance; however, thanks to Hatohara, she became warmer and more comfortable in social situations. She is protective of Tsuji, sternly forbidding other girls to mess with him. During combat she is dispassionate and concise.

Shinnosuke Tsuji
Hiyami is one of the only two girls Tsuji can converse comfortably with, although her guarded personality put him off at first. Since then, the two have grown close, with Hiyami being protective of him when their female schoolmates tease him. The two hang out together and with the other members of Ninomiya Unit on occasion, including a teammate's birthday. Hiyami addresses him by his surname followed by the honorific -kun, whereas he addresses her by her nickname.

Mirai Hatohara
Hatohara's advice was instrumental in allowing Hiyami to overcome her discomfort in social situations. Prior to her defection, the two used to hang out together and with their other teammates, including for their birthdays. Unlike Ninomiya, Hiyami does not appear to resent Hatohara for her defection and speaks about her with ease. She refers to the Sniper by her surname, with the addition of the honorific -sempai.

Masataka Ninomiya
Hiyami and Ninomiya are close enough to hang out together with their teammates outside of Border, including for a unit member's birthday. They do so often enough for Ninomiya to order a drink on her behalf.

Sumiharu Inukai
Hiyami and Inukai are close enough to hang out together with their teammates outside of Border, including for his birthday. She addresses him by his surname followed by the honorific -sempai, while he uses her nickname.

Kyōsuke Karasuma
Hiyami has a crush on Karasuma.

Abilities
As the Operator for a former A-rank unit, Hiyami is bound to be very competent at processing and prioritizing information. Further proof of her multi-tasking skills is the fact that, prior to Hatohara's defection, she was in charge of managing as many as four agents. The data she relays can be supplemented by her own insightful analysis: at the very start of round four she was able to infer that the missing trion signatures belonged to the Attackers of Azuma Unit, as well as to predict that they had added Grasshopper to their Trigger Sets, displaying strategic aptitude with Triggers despite not wielding them herself.

Hiyami appears to be skilled at operating her terminal, researching and sending schematics to her allies promptly and enhancing their vision as necessary.

Quotes

 * (To Kirie Konami and Shiori Usami) "No messing with our Tsuji!"

Trivia

 * Hiyami likes sweet and sour pork, yogurt, and baths.
 * According to the author, she has the slickest hair of any female character due to his editor's finishing touches. Accordingly, he referred to her as "slick" in her character profile.