[7][10] Aimer teamed up with the "Agehasprings" group, which has worked with, produced, or provided music for various artists, including Yuki, Mika Nakashima, Flumpool, Superfly, Yuzu, and Genki Rockets.

The number 1 record cover was based on Lady Gaga's "Poker Face", and was the first song to appear in the lead album chart for the jazz category in the iTunes Store.

On September 7, 2011, Aimer debuted for Defstar Records, with the song "Rokutousei no Yoru", which was selected by Fuji TV as the ending theme of the 2011 anime series No.

This single was intended to be the theme song and background music for Sasaki Nozomi's drama, Koi nante Zeitaku ga Watashi ni Ochite Kuru no daro ka?.

On August 15, Aimer released her fourth single, "Anata ni Deawanakereba: Kasetsu Toka / Hoshikuzu Venus", which included a cover of Neil Sedaka's "Breaking Up Is Hard to Do".

The first track of this single "Anata ni Deawanakereba: Kasetsu Toka" is an ending song of Fuji TV's anime series Natsuyuki Rendezvous.

"[18] Aimer's eighth single, "Brave Shine", was used as the second opening theme to the Fate/stay night: Unlimited Blade Works anime, and was released on June 3, 2015.

[20] On August 18, 2016, Aimer announced her special 4th studio album Daydream would be released on September 21 featuring collaboration songs between her and popular artists such as Taka (One Ok Rock), Yojiro Noda (Radwimps), TK (Ling Tosite Sigure), chelly (Egoist), Takahito Uchisawa (androp), Hiroyuki Sawano, Sukima Switch, and Mao Abe.

Also includes the ending theme of Kabaneri of the Iron Fortress (anime) made in collaboration with chelly (Egoist) and Hiroyuki Sawano and more for 13 tracks total.

[23] Following the announcement of her 4th album Daydream, Aimer performed the ending song to the Season 5 of anime series Natsume's Book of Friends, "Akane Sasu".

[24] On January 5, 2017, it was announced that Aimer wrote a song for the Japanese culinary exhibition "Tabegamisama no Fushigina Resutoranten" directed by the multimedia entertainment studio Moment Factory.

[26] Later, it was also revealed another single, which would be used as opening theme for the Japanese drama Ubai ai, fuyu, titled "Kogoesōna Kisetsu Kara", and would be released on February 10, 2017.

[30] On September 7, 2018, Aimer released the single "Black Bird", which was used as the theme song for the Japanese live-action film adaptation of the manga Kasane.