"The Executioner and Her Way of Life" is set in a world where individuals known as "Lost Ones" are transported from modern-day Japan, bringing with them dangerous magical abilities that often lead to catastrophic consequences. To maintain order, the Church of the Exalted employs executioners tasked with eliminating these Lost Ones before their powers can wreak havoc. The story centers on Menou, a young executioner who has dedicated her life to this duty, and Akari, a Lost One who possesses a unique and mysterious power that complicates Menou's mission.

Menou encounters Akari after a series of events involving other Lost Ones, and she initially plans to eliminate her as per her training. However, Akari’s ability to manipulate time and her apparent immortality make her an unprecedented challenge. Akari’s cheerful and affectionate demeanor contrasts sharply with Menou’s stoic and duty-bound personality, creating a dynamic that evolves as the story progresses. As Menou struggles to fulfill her role, she begins to question the morality of her actions and the true nature of the Church’s directives.

The narrative explores themes of morality, duty, and the consequences of wielding power, as Menou and Akari’s fates become increasingly intertwined. The series delves into the broader implications of the Lost Ones’ existence, the Church’s motivations, and the societal structures that perpetuate the cycle of violence. Supporting characters, such as Momo, Menou’s devoted and fiercely protective assistant, and other executioners and Lost Ones, add depth to the world and its conflicts. The story balances action, mystery, and emotional tension, presenting a layered exploration of its central characters and their choices within a morally complex setting.