The whole concept of an all-boys high school is kind of cruel when you think about it. You take a bunch of young men who have only recently hit puberty and are practically oozing hormones out of their pores and lock them in a prison-like environment filled with nothing but other males for the majority of their teen lives.
So it’s understandable that at least one Japanese all-boys high school, faced with an utter lack of girls to ogle, chose to get a little creative… by holding an annual beauty pageant to determine the prettiest “girl” in school.