"Tachiagirl" (タチアガール, Tachiagāru) is the 7th major single by the Japanese girl idol group S/mileage.
It was released in Japan on September 28, 2011 on the label Hachama.
In the Oricon weekly chart, it debuted at number 4.
[1] The B-side of the Limited Edition C is a cover of the song "Boogie Train '03" by Miki Fujimoto.
All the limited editions came with a sealed-in serial-numbered entry card for the lottery to win a ticket to one of the single's launch events.