Japanese culture may seem strict and uptight, and in many ways it is. Still, when it comes to entertainment they have a very relaxed attitude to gender bending. There is even a body swap porn genre.
In anime (Japanese style animated movies) quite a few plots are based on boy being changed into girl, and that applies also to non-erotic material. Well, maybe non-erotic is not exactly the word we are looking for. There are plenty of very curvy bodies in sexy school girl uniforms, even if there is no explicit sex.
