Two years have passed since an elusive sorceress introduced the world to magic, by way of a single simple spell. Easy enough that anyone can cast it, and powerful enough to let people transform themselves to achieve their ideal body. After two years, almost everyone knows at least one person who's used it.

It's even become common enough that high-school students have started using it as a rite of passage - the first full moon after their 16th birthday some teens use powerful life-chaning magic to make token cosmetic alterations to themselves, just to prove they've done it. Most change their hair or their eyes, but some students go a little further...