__Height:__ 140 cm (4'5") A sniper and member of the Mikumo Unit (a B-rank team) at the Border Tamakoma Branch. She possesses an exceptionally gentle personality and tends to prioritize others over herself. Due to past trauma, she avoids asking for help and has a habit of acting in a self-sacrificing manner. Those around her are concerned by this tendency and are attempting to help her shift her mindset, hoping she will learn to prioritize her own safety when the situation demands it. She is a childhood friend of [Osamu Mikumo](https://anilist.co/character/81237/Osamu-Mikumo); their connection stems from the fact that her older brother, [Rinji Amatori](https://anilist.co/character/179732/Rinji-Amatori), served as his tutor. They also attend the same junior high school. It was, in fact, because of her that Osamu joined Border. She possesses an extraordinary amount of Trion—at least three times the level of the Border agent with the highest recorded parameters. Because of this immense Trion capacity, she has been targeted by Neighbors since she was young. This is the underlying cause behind the disappearance of her [friend](https://anilist.co/character/179734/Aoba-Harukawa) and her older brother (or, at the very least, she believes it to be her fault).