Kazue Takanashi, the 31-year-old eldest sibling of the Takanashi family, stands tall at 1.75 meters. She works as an attorney, her brown hair usually pulled into a ponytail and brown eyes framing a distinctive beauty mark beneath the left corner of her lips. Her professional demeanor extends beyond the courtroom; she often carries a thick law book, wielding it figuratively and literally as a tool or weapon during arguments. Within the family, Kazue blends intimidating bossiness with a stern, no-nonsense attitude, particularly toward her siblings Izumi and Kozue. She frequently scolds Izumi for unhealthy writing habits and Kozue for alcoholism, her harshness rooted in genuine concern for their well-being. In contrast, she displays a softer side by spoiling her youngest sister, Nazuna. Externally, she presents a polite and competent facade. Kazue's past includes a tumultuous marriage to Toru Minegishi, an employee of her mother. His extreme masochistic tendencies repeatedly provoked her anger, leading to divorce. This topic remains sensitive, triggering aggressive reactions if Izumi references it. However, Toru dramatically begged for her forgiveness at her workplace, resulting in their eventual reconciliation and remarriage. As the oldest sister, Kazue assumes a quasi-parental role, especially over Souta Takanashi, who is ten years her junior. She often dismisses his viewpoints and intervenes in family matters with authoritarian assertiveness. Her underlying concern surfaces during crises, such as Izumi's disappearance; while outwardly downplaying the situation to Souta, she privately panicked and considered contacting the police. Her name, Kazue (一枝), meaning "one branch," reflects her foundational position as the family's elder sibling. The surname Takanashi (小鳥遊) combines "little bird" (小鳥) and "play" (遊).