The information here comes from a post made by the official account on Hoyolab on 4 August 2024.

Rumor has it that there is a young maiden in the universe who was instructed by brilliant masters through coincidence. After just a few days of training, and using but her own strength, she cut apart 10 exquisitely made mechas using her blades and brought peace to the land. Thereafter, everyone in the area proclaimed her “Super-March.”

Super-March couldn't bear the thought of having her swordplay lost in the ages, so she recorded her various experiences during her training, hoping to help someone in need someday.

“March, are you sure you want to write this as the book's quote?”