The musical partnership of Nagi Sanzenin and Hayate Ayasaki is directly tied to the anime and media franchise Hayate no Gotoku!, also known as Hayate the Combat Butler. As characters within the series, their musical releases are performed by their respective voice actresses: Rie Kugimiya as Nagi Sanzenin and Ryoko Shiraishi as Hayate Ayasaki. Their discography consists primarily of character songs, image songs, and theme music released as singles and albums under the Geneon label.

Rie Kugimiya, as Nagi Sanzenin, has several notable solo music credits. Her solo character single, Hayate no Gotoku! Character CD 3 - Sanzenin Nagi, was released on July 25, 2007. This single includes the songs Dame! and Zo!. Dame! was used as an insert song in episodes twenty and twenty-one of the first anime season, while Zo! served as background music for a television commercial advertising the Nintendo DS game Hayate no Gotoku!: Boku ga Romeo de Romeo ga Boku de. Kugimiya also performed Karakoi -Dakara Shoujo wa Koi wo Suru-, which was used as an ending theme for Hayate no Gotoku!!, the second season of the anime, specifically for episodes eighteen through twenty-four. This song was released as a single on September 9, 2009. As a solo artist, she also performed the song Here I am Here we are, which was featured as an ending theme for the 2012 series Hayate no Gotoku! Can't Take My Eyes Off You.

Ryoko Shiraishi, as Hayate Ayasaki, released her debut character single, Hayate the Combat Butler Character CD 1 - Hayate Ayasaki, on May 25, 2007. This single contains the songs Boku wa Kimi no Mono and Unmei no Price. Boku wa Kimi no Mono was featured as an insert song in episodes ten and twenty of the first anime season. Shiraishi also performed the song Heroine wa Koko ni Iru!, which was used as the first ending theme for the 2013 series Hayate no Gotoku! Cuties, and Invitation: Kimi to Iru Basho de, which served as its twelfth and final ending theme.

The two artists have collaborated on several duet releases as their respective characters. One of their most significant joint releases is the single Hayate no Gotoku! Character CD 11 - Ayasaki Hermione vs Magical Girl Pretty Nagi, released on March 21, 2008. This character CD features Ryoko Shiraishi as Ayasaki Hermione and Rie Kugimiya as Magical Girl Pretty Nagi. The single includes the duet songs Oh! My Honey, performed by Shiraishi, and Koishitara Fantasy, performed by Kugimiya. The music for these tracks was composed by Kohei Tanaka, with lyrics by Mike Sugiyama, and arrangements by Takayuki Negishi and Minoru Maruo. The release also contains drama tracks and various bonus content.

A comprehensive album featuring both artists alongside other main cast members was released on May 8, 2013, titled Can't Take My Eyes Off You. This album includes several key tracks from the franchise, such as Karakoi -Dakara Shoujo wa Koi wo Suru-, Here I am Here we are, and a new duet version of Can't Take My Eyes Off You performed by Hayate Ayasaki and Nagi Sanzenin.

The music associated with Nagi Sanzenin and Hayate Ayasaki is characterized as anime character and image songs, a common practice in Japanese media franchises where voice actors perform songs from the perspective of their characters. Their musical identity is inseparable from the Hayate no Gotoku! series, with their songs contributing to the show's soundtrack and expanding its narrative through musical expression. They have worked with various composers and arrangers, including Kotaro Nakagawa, who is credited for the series music, as well as Kohei Tanaka, Mike Sugiyama, Takayuki Negishi, and Minoru Maruo on specific character singles. These releases are considered significant within the anime industry as they exemplify the character song business model, where vocal performances by voice actors serve both as promotional material for the anime and as standalone music products for fans.