Tomodachi Kara Yoroshiku Desu

From StarryHeaven:
Jun has always liked the super popular and hot Kazumi-kun. However, he always has girls competing for his attention. So when the newest issue of a shoujo magazine comes out, she buys it for the furoku (freebie): a paper charm that you write your wish on and put under your pillow so that it’ll come true. Her wish? To be with Kazumi-kun. She doesn’t expect the charm to work anyhow, as she’s never had any luck with them. To Jun’s surprise and delight, in the morning she wakes up to find that she’s friends with Kazumi–but in a boy’s body!