May Nakabayashi (中林 芽依 Nakabayashi Mei), better known by her stage name May'n (メイン Mein), is a Japanese J-Pop artist. In the Kamen Rider franchise, she, with former Surface vocalist Yoshiharu Shiina formed a special band called Astronauts. As Astronauts, they sang the song Giant Step and Cosmic Mind for Kamen Rider Fourze.