Let's Go, Teyvat High! Aether High school AU

Aether has gotten separated from his sister Lumine due to Lumine's failing grade! Will they meet again, or a love story happens? DISCLAIMER! 1. This isn't canon, but some storylines in here may be similar to canon storylines 2. First time writing, I'm not skilled yet! 3. ALL characters belong to MiHoYo, I on...