Welcome to "Belly Button Rings General Education Academy"! It's an all-girls boarding school with de jure six different campuses across the world in UK, US, Brazil, Egypt, Japan and Australia, but de facto there is one campus in another dimension called Heaven. All the schoolgirls and female-only teachers, and even the female principal, they all wear sexy uniform. Female uniform consists of white knotted blouse, red tartan necktie, red tartan miniskirt, white socks, white lingerie, black shoes. The entire skin of girls' bellies should be exposed. Also all the girls should have their navels pierced and adorned by dangling bellyrings of any materials. And you are the first male ever here to study! These girls will be in love with you. Some of them are not humans but angels in human disguise!