10-sai no Saikyou Madoushi

A ten-year old girl named Ferris was a slave working in the magic stone mine. However, she was discovered to possess an astonishing amount of magical power, and she was enrolled in a magic academy. She is watched over by various people as her talent improved with tremendous speed. Every political faction made moves to try to control her power. Ferris was the only person who did not know she was a powerful magician. Ferris was satisfied as long as she had plenty to eat every day.