Shinigami ni Sodaterareta Shoujo wa Shikkoku no Tsurugi wo Mune ni Idaku

As a child, Olivia was found alone in the forest by a mysterious death god named Z, who took her in and trained her in combat—though his true motives remained unclear. Years later, Z vanishes without warning, leaving only a letter behind. In it, he orders Olivia to travel to the Kingdom, armed with a sword imbued with the power of a death god. With no understanding of the world, no social graces, and little sense of normalcy, she sets out on her journey—straight into the heart of the military.