She works as an agent for the Special Ability Department, where she's been assigned to partner with Ayatsuji Yukito. Her ability, called Yesterday's Shadow Tag, lets her summon a creature known as the "Shadow Child"—a sentient life-form that dwells in her shadow. The catch is that it's basically independent; she can't control it, and it tends to show up whenever it feels like.
In her downtime, she's into spy films and paranormal documentaries, and she's never without a hot latte if she can help it. She can't stand lectures, unsolvable problems, or adults who take themselves too seriously. Fans often note that her personality clashes pretty entertainingly with her job, especially when the Shadow Child decides to act on its own schedule.
Content compiled by AnimeList.moe from publicly available sources.