
Ear piercings are against Japanese school dress code. They also have other restrictions against hair color, makeup, nail polish, and jewelry. I believe that in uni, they don't care about those things since they treat you as an adult. ofc US vs japan will be very different lol!! culture and values are totally different

Authors usually exaggerated the issue for storytelling purposes but yes some schools in many countries dont allow wear piercing, jeans, dye hair, long hair etc. In my country I have schools that don't give a shit and schools that forbidden everything from long hair, jeans to makeup. Most public schools are private so they can set any rules they wish (but they get government funding).
Just realized that everytime in anime/manga they called it pierced earrings even though it's just a normal way in us wearing an earring in school? (of course not the flashy ones) Are yall also allowed earrings in school or...?