"The Executioner and Her Way of Life" is a dark fantasy manga set in a world where individuals from Earth, known as Lost Ones, are summoned and granted immense magical powers. These powers, however, often lead to catastrophic consequences, destabilizing the world. To prevent such disasters, the Church of the Rectitude dispatches executioners to eliminate Lost Ones before their powers can wreak havoc.

The protagonist, Menou, is a young executioner tasked with this grim duty. Her life takes a dramatic turn when she encounters Akari, a cheerful and seemingly ordinary Lost One. Unlike others, Akari possesses a unique ability: she cannot be killed. Every time Menou attempts to execute her, Akari resurrects, complicating Menou's mission. As the two form an uneasy alliance, they embark on a journey to uncover the truth behind Akari's immortality and the broader mysteries surrounding the Lost Ones.

Menou is a stoic and disciplined individual, shaped by her harsh upbringing and the weight of her responsibilities. Akari, in contrast, is optimistic and carefree, often clashing with Menou's serious demeanor. Their dynamic evolves as they travel together, with Akari's unwavering trust and affection gradually challenging Menou's resolve. Supporting characters include Momo, Menou's devoted and fiercely protective assistant, and other figures within the Church who have their own agendas.

The narrative explores themes of morality, duty, and the consequences of wielding power. It delves into the ethical dilemmas faced by Menou as she grapples with her role as an executioner and her growing attachment to Akari. The world-building is intricate, with a detailed hierarchy within the Church, various factions vying for control, and a rich history of conflict involving the Lost Ones. The story balances action, mystery, and character development, creating a compelling and thought-provoking tale.