Tachiagirl (タチアガール; Stand Up! Girls) is S/mileage's 7th major single. It was released on September 28, 2011. The Single V was released on October 12, 2011. This is the first and only single to include sub-members, as well as the only single to feature Kosuga Fuyuka. The single sold 26,328 copies and ranked #4 on the oricon weekly chart.