Just as he was entering high school, Nanaki Koga experienced a certain accident and fell into a deep coma. After two years, he finally woke up.

However, he found that the world had changed. While he was unconscious, a sudden craze hit Japan: crossdressing. Now the newest fad, approximately 90% of Japanese people dress up as the opposite gender.

And so Nanaki re-enrolls in his all-boys school, in which every student wears a sailor fuku. And as luck has it, Nanaki has a surprisingly feminine face...