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Due to Nieve's concerns and to follow the protocol of a knight, she ended gathering the soldiers and knights which we had spoken to. She explained to them that the culprit was probably Florie. The people was shocked. Florie seemed to be well known by some due to Nieve's stories. She had told them to her fellow friends about her every day in her services as a soldier before ascending into a magic knight.
So they were surprised and even doubtful when she told them Florie might be the culprit. Nieve herself didn't wanted to believe that either, but it was better to make sure it wasn't by going there, capturing her, interrogating her, and using magic artifacts to see if she was saying the truth or not.
Check "The Protagnist's Sister Is Actually the Strongest"!