Village Daughter of a Potato Farmer, Until She Was Praised as a Sword God

I, Tremina, was an ordinary village girl. No, maybe less than ordinary. I was said to be easy-going for a long time, and I was not good at any form of exercise. At a young age, I decided to take over my family’s potato farm. With that involved, I was able to enroll in a knight training school. There, I discovered a great talent of mine, aided by my gentleness and overwhelmingly strong mental strength. Anyway, I was able to forge mana without feeling tired at all. Mana is the source of life and power, and if an ordinary person trains with it for two hours a day, they will, naturally, be completely exhausted. But I was able to go on and on for hours and I never got tired. By the way, except...