moe moe's Things

hello! i’ve been looking around in my list of read mangas and i can’t find the one where there are four main people: a short-haired girl that plays a horn instrument, her shy, pretty girl friend, a guy that the short-haired girl like, and another guy that i kinda forgot. what i remember clearly is that the shy, pretty girl likes her teacher that’s also the club adviser (afaik) of the short-haired girl).

thank you for the assistance!