Girl group Rainbow are gearing up for their debut in Japan, and a short preview of their first music video has finally been revealed! Rainbow will debut with their hit track, "A", and it looks like they'll be bringing back the sexy 'abs dance' that was banned back home. Japanese entertainment program 'Oha!4'�briefly interviewed the girls, in addition to covering the filming process on-set. Check out the short MV preview below! -- Rainbow have also updated their YouTube channel with an official teaser as well: Rainbow plans to make their debut in September, so stay tuned to allkpop for more details! - Tip: Win