2005—2006: Early days and debut
AAA was originally planned to be a 6 member group. At first, members included Takahiro Nishijima, Naoya Urata, Shuta Sueyoshi, Shinjiro Atae, Mitsuhiro Hidaka and Misako Uno as the only girl. Avex later decided to add two more girls; Chiaki It? and Yukari Goto. As songs like "Blood on Fire" and "Friday Party" were previously prepared for 6 members, the two girls are only heard in the refrain.
In the summer of 2005, avex announced the debut of a new pop/eurobeat group consisting of boys and girls who have undergone training in the avex artist academy, the record label's training facility for singers, dancers, and other entertainment talents. Because of this, the group's debut was much anticipated and was received well by many fans. In their debut year, they received the "Best Newcomer Award" at the 47th Japan Record Awards. From September to December they released a single each month plus a photobook and their very first album, Attack, in January 2006. With all the previous advertisement and releases the group did not have time to perform their songs live. However, as each of their singles has a different genre this did not cause a problem with sales.
Misako Uno, the female lead, starred alongside Sarah Michelle Gellar in the Hollywood version of The Grudge 2 in 2006. She played a one of the 3 school girls and all of her lines were in English. After releasing mini album All/2 on September 13, 2006, AAA released their second studio album All on January 1, 2007.
2007—present: Media mix and acting
AAA is also performing the opening for 2007's Kamen Rider, Kamen Rider Den-O and also for Delicious Gakuin. For this single, "Climax Jump," they have temporarily changed their name to AAA Den-O form. The single was certified Gold by the Recording Industry Association of Japan (RIAJ) for the shipment of 100,000 physical singles and 100,000 full-track ringtone music downloads (or Chaku Uta Full) each.
AAA appeared at Otakon 2007 in Baltimore, Maryland. Guests: Musical
AAA had their first Oricon weekly number 1 single in 2008 with "Mirage." AAA also appeared on the theaters and Nishijima manifested interest in the acting. He appeared in the film Love Exposure, which was the first film for him to play the main role. He performed cross-dressing in the film and eventually won the Sponichi Grand Prix New Face Award of the year 2009 on January 19, 2010. AAA's new single "Aitai Riy?/Dream After Dream " topped the Oricon weekly charts in May 2010, becoming their second number 1 single on the charts. New single Makenai Kokoro is set for an August release. The song is similar to the their HEARTFUL era, Uno and Ito sing the majority of the song while Hidaka provides backing rap vocals. The song debuted at number 3 in the oricon charts at 45+K.