AAA (pronounced Triple A; also an acronym for Attack All Around) is a Japanese pop group signed to the label Avex Trax which debuted in September 2005.

The name has the meaning of "challenging everything" or "against all odds",[1] and the group is marketed by their label as a "super performance unit".

As the songs "Blood on Fire" and "Friday Party" were prepared before their debut for six members, the two girls are only heard in the refrain.

[7] Uno, the female lead singer, starred alongside Sarah Michelle Gellar in the Hollywood version of The Grudge 2 which opened in theaters October 2006.

[9][10] The group's members gradually started delving into acting jobs, giving them more mainstream exposure.

Their 14th single "Kuchibiru Kara Romantica/That's Right" was tied-up with television drama serial Delicious Gakuin, which starred members Nishijima and Atae.

[11] On 11 June 2007, it was announced that Goto would be leaving the group permanently, citing her health problems and deciding to focus on recovery.

AAA scored their first Oricon weekly number one single in 2008 with "Mirage",[14] and the group released their first compilation album Attack All Around.

Nishijima received his first starring role in film, playing the lead character in Love Exposure, which released in January 2009.

[18] After a string of moderate hits throughout 2007–2008, AAA started a successful era in 2009 with their album Heartful and all of its preceding singles debuting in the top three.

[19] "Hide Away" also represented a new era of sorts for the group, as Ito started to sing more lines, joining Nishijima, Uno and Urata as lead singers.

Due to the popularity of "Aitai Riyū", they were invited to make their debut appearance on Kōhaku Uta Gassen that year, greatly heightening the group's exposure.

In December, member Urata released his own single "Dream On" featuring his good friend and label mate Ayumi Hamasaki.

[22] Starting from "Call/I4U", the group also gradually shifted away from the "lead singer" position and more equal singing opportunities were given to all members.

It is the largest scale tour the group has attempted to date, taking place at 41 venues with an estimated 150,000 fans attending.

[25] In May, it was reported that AAA no Kizuna Gasshuku which had ended, recorded over 10 million plays on YouTube, and the second season began airing.

On 14 January 2014, it was announced that AAA had been appointed the PR ambassadors for the fifteenth anniversary of anime One Piece, and provided a new song titled "Wake up!"

[32] In 2015, AAA released their 10th Anniversary Best studio album, which contained the singles, "I'll be There", "Lil' Infinity" and "Aishiteru no ni, Aisenai".

[36] On their last day of -LEAP OVER- Tour, on July 24 at SEKISUI HEIM SUPER ARENA, they announced their first Tokyo Dome performance which was on November 16, 2016.

[38] On January 12, 2017 it was announced that Chiaki Ito would be leaving the group at the end of March because of pregnancy and marriage.