Otsuka Aina (大塚愛菜) is a Japanese pop singer who was signed to Hello! Project. She is a former member of Juice=Juice and Hello Pro Kenshuusei. She was first introduced as a trainee at a fanclub event in June 2011 alongside 2 other girls. It was announced on July 5, 2013 that she had withdrawn from both Hello Pro Kenshuusei and Juice=Juice, subsequently leaving Hello! Project.