[4] In April 2012, Alan Shirahama, Ryota Katayose, Ryuto Kazuhara, Hayato Komori, Reo Sano, and Mandy Sekiguchi were announced to the public as official members.
Generations then made their major debut on 21 November, with the single "Brave It Out", which was used as theme song for the NTV drama Sugarless starring Alan Shirahama and Reo Sano.
On 3 September 2014, the group released their sixth single "Always with you", it was used as the theme song for the Japanese drama Is There a Vet in the House?
[9] The world tour was scheduled to take place in June, with stops in Paris, London, Los Angeles, New York, Taipei, and Hong Kong.
[11] In addition, the first single of the year titled "Sing it Loud" was released on January, 28, which was used as the theme song for TBS drama "Daddy Detective".
[12] On 16 September 2015, the group released their 10th single "All For You", which was used as theme song for the movie Girl's Step, starring E-girls member Anna Ishii.
In March 2018, Generations collaborated for the first time with American fashion brand Guess on a unisex capsule collection.
[23] In 29 November, Generations and E-girls were chosen to promote the "Energy Project" by LDH martial arts by releasing 2 digital singles "G-ENERGY" and "EG-ENERGY", respectively.
The first single of their 3-month project, released on 17 July, is titled "Brand New Story", which was used as the theme song of the anime movie Ride Your Wave in which Ryota voiced as the main character.
To promote the single, a music video was released on 21 June featuring the members in animated form created by Science Saru.
The single included "Control Myself" as a B-side track, being the group's first original English song featuring Mandy as a rapper.
Musically speaking, "Dreamers" is the first group's song with a simple acoustic guitar sound and a slow tempo.
[25] The single featured the B-side "A New Chronicle", the theme song of the group's dome tour, and was released on 28 August.
[27] The single was released on 25 September featuring the track "Snake Pit" as a B-side, one of the songs in the soundtrack of the movie High & Low: The Worst in which Hayato and Yuta made their debut as actors.
[33][34] On 21 February 2020, it was revealed that the group would release their second collaboration with American fashion brand Guess consisting of a new collection, lookbook and Pop-up in Tokyo.
In compensation, Generations held a series of livestreamed concerts on the Japanese streaming platform AbemaTV from July to December.
[43] On 27 September, it was announced that LDH Pictures' 4th Cinema fighters project "Kinou Yori Akaku Ashita Yori Aoku", which consists of six short films would feature 6 of Generations members as lead actors while Ryuto Kazuhara would be in charge of one of the theme songs, the project would be released in 2021.
[46] On 10 February, Generations released their first single of the year titled "Ame Nochi Hare" as the theme song of TV Asahi Saturday night drama Mokomi: She's a little weird.
[47] On 18 April, a new album by Jr.Exile for the Battle of Tokyo Project titled Battle of Tokyo Time 4 Jr.Exile was announced to be released on 23 June, the songs by the individual groups and the collaboration song of Generations & The Rampage were pre-released digitally from 19 April to 21 June, the music videos were released in a hybrid live-action/animated form, with this latter featuring the four groups' avatars.
[53] On 6 October, Generations released their 26th single titled "Unchained World" as the ending theme song for Netflix anime Baki Hanma.
starring Gekidan Exile's Keita Machida, it included the track "Atarashii Sekai" previously released digitally on 23 May, the single was out on 3 August in three editions.