Kaede, a diligent office worker who spent her entire career in the accounting department, suddenly finds herself transported to a fantasy world. Moments after arriving, she is attacked by a monster and nearly killed, but she is rescued by a passing knight named Franz. Franz belongs to the Western Knights, an order tasked with protecting the realm from monsters. With nowhere else to go, Kaede agrees to travel with the knights to the capital. As she spends time with them, she quickly notices that the knights, while brave and skilled in combat, are hopelessly disorganized when it comes to managing their finances. Their budgets are a mess, supplies are mismanaged, and their accounts are in disarray. Seeing an opportunity to put her professional experience to use, Kaede begins to offer advice on budgeting, record‑keeping, and cost‑saving measures. Her practical knowledge slowly earns her the knights’ trust, and what begins as a temporary arrangement turns into a permanent role. Kaede gradually becomes the de facto treasurer and bookkeeper for the Western Knights, affectionately nicknamed the “safe keeper.” As she settles into her new life, she grows closer to Franz, develops friendships with other members of the order—including a female knight and a young squire—and tackles a series of financial and logistical challenges. A notable early arc involves Kaede using her accounting skills to help the knights survive a dragon attack by efficiently allocating resources. In later storylines, Kaede’s position is formalized when the captain, Gerhard, asks her to become the official assistant treasurer. Soon after, she uncovers evidence of embezzlement hidden in the knight order’s ledgers, leading to an investigation that reveals a deeper conspiracy. Throughout the story, Kaede balances her growing affection for Franz, the demands of her new job, and the warmth of a slow‑paced life in a foreign world, all while proving that even ordinary office skills can make a heroic difference.