Reina’s Magic Stone and the Promotion Exam

Reina, a C-ranked magician belonging to the Guild of Magicians challenges a promotion exam to achieve B-rank, but the content of the exam is to obtain a rare mineral magic stone. Hearing that there was a magic stone in a certain village, Reina left the royal capital and went to the village of Asto.
She is proud of her great skill and quickly obtains the magic stone. She is so proud of her skill that she quickly obtains the magic stone and is happy to return home.
A man claiming to be the master of the messenger appears, but he is told that she has lost control of it.
Reina is forced to scramble around the village in search of the messenger in order to get the stone back, but will she be able to get the stone safely and finish the examinations?