Victoria of Many Faces, Vol. 2 (light novel) — SYUU

Five years have passed since Victoria abandoned life as a spy and started taking care of Nonna. After returning to the Kingdom of Ashberry and reuniting with old friends, she discovers a cipher in a book and decodes it. The cipher leads to a treasure, and Jeffrey and Nonna support Victoria in her desire to chase after it. Thus begins a grand adventure that will reveal Ashberry's secrets.