Yuushou Shitara Shouhin wa Ohimesama deshita (Associated Names)

Sylia, a swordsman, was a 15-year-old girl moving from place to place, making a living as a mercenary. One day, she participates in a national competition to earn a lot of money and won it narrowly. However, the grand prize for that tournament was the princess of the royal family holding the event?! The marriage…