So i just read it and suddenly remember there's a manga really similar to this

The setting also nearly similar even the characters interaction

So i think mc attend some elite school, he also have little sister who studied there before mc got in

mc was a normal human or such, but somehow it found out he have great talent and ability and forced to move out school to the elite school

the thing there is two division(like magica sword and summoner) , i remember the two division like heaven and earth, elite and peasant division i think ?

MC then go attend the school, and meet a girl with short hair who was a senior student. She greet him with a smile.

Then suddenly mc sister come and say why mc been put into the elite faction, she also tell mc the elite faction are bad. The senior student face suddenly become cold/angry and say the transfer already decided and asked mc sister to leave.

Then the senior student say they already loaded all mc stuff in the carriage and she will show him around the school. MC sister seem ordered to return to her dorm( she do it with mad and worried face).

Is it perhaps chapter one shot or chapter pilot i was reading or what ?

this have been bugging me