@willyt I suggest you read the translated web novel version: https://www.novelupdates.com/series/mushoku-no-eiyuu-betsu-ni-skill-nanka-iranakattan-daga/
It goes from all color mage into a city where "classes" dominate the caste system and then into monster tamer like @SaitoHimea said, followed by a quick intermission youngest sister running away, arel being diverted into a bit of conquering dungeons, followed by a SS of the youngest sister in thiefland and arel slowly catching up
The magic academy arc are the most cringe arc of this series. All the arc before this shows arel overcoming the skill less class and he had to acquire skill by other means (training harder than others). This arc however, is so boring.
i'm glad the teacher isnt some cliche self centred prick going all "I-IMPOSSIBLE!!! WHAT YOU JUST DID WAS IMPOSSIBLE!!!" but rather the teacher is willing to learn new things and is open to change.
Glad to see this for once