She is a papermaster, a person with the ability to bend paper material to her will, making it bulletproof and durable enough to use as a weapon, among other, more creative applications.
Yomiko is assigned her missions by the British Library special operations commander, codenamed "Mr.
She often works with partners, such as the American mercenary Drake Anderson, the clumsy but capable junior field agent Wendy Earhart, and the suave wall-phasing gunslinger girl, Nancy Makuhari.
When not on missions for the British Library, Yomiko works as a substitute teacher,[9][10][11] a job through which she meets her favorite author, Nenene Sumiregawa.
[12] The OVA does not carry on from the books or manga and picks up with her still working loyally for the British Library, where she meets a new partner in espionage, Nancy Makuhari, aka "Miss Deep" (introduced as a new character, although she existed previously in the novels).
Four years before the start of the series, she is provoked by Joker and ends up in a moment of temporary psychosis, assaulting the library with her papermastery and causing it to go down in flames.
She has abandoned and betrayed the British Library upon learning of Joker's plot to use the second Nancy's son as a vessel to be overtaken by the mind of Mr.
She is a light-skinned woman of average height with dark blue eyes long straight black hair.
Even when she leaves the British Library in the TV, she still wears the same outfit, only swapping the necktie for a small red ribbon instead.
Yomiko sports enormous, black, square-rimmed glasses; in the manga she reveals these were Donnie Nakajima's, and she refuses to remove them even when sleeping.
In the TV, Joker implies Donnie's fate is even worse than Yomiko thought, sparking her temporary insanity during which she destroyed the British Library.
Yomiko loved Nenene Sumiregawa before ever meeting her, sharing the joy of reading the young author's novels with her mentor and romantic partner Donnie Nakajima.
When Yomiko met Nenene she begged her for her autograph, but didn't earn it until she had rescued the author from a vicious kidnapper.
However, Miss Deep nearly kills her, and the clone loses much of her memory due to brain damage caused by asphyxiation.
In the TV, an older and very jaded Wendy is bitter about Yomiko's causing the British Library fire, feeling betrayed by the woman who was once her hero.
In the TV, young Anita is a victim of the British Library fire and recalls Yomiko's silhouette standing out amid the flames in her most traumatic memory.