"Babymetal × Kiba of Akiba" (BABYMETAL×キバオブアキバ^?) is a joint single by the bands Babymetal and Kiba of Akiba. The single was first released in Japan on March 7, 2012 to promote the album Sakura Gakuin 2011 Nendo: Friends.

Babymetal and Kiba of Akiba first met under the management of the main group Sakura Gakuin, and later, decided on a collaboration. The split single was announced by Tower Records Japan on February 9, 2012, and was the fifth single released to promote Sakura Gakuin 2011 Nendo: Friends'.

The single contains two original songs, one performed by Babymetal and one by Kiba of Akiba, and two bonus tracks. The first bonus track, "Kimi to Anime ga Mitai (Answer for Animation with You)" is a cover of the Kiba of Akiba song "Animation with You", as performed by Babymetal. The second bonus track is a remix of the Babymetal song "Doki Doki ☆ Morning", as performed by Kiba of Akiba.

On April 6, 2012, Babymetal performed at Tower Records Japan in Shibuya to commemorate the release of the single.

"Iine!" (いいね!^?, "Isn't it good!") was first released as the band's second single as a subgroup of Sakura Gakuin, and the fifth single overall from the album Sakura Gakuin 2011 Nendo: Friends, from which an remix of the song, "Iine!" (Vega Mix Ver.), was featured.

The band premiered the song at the concert “Woman's Power 20th Anniversary” at Shibuya O-West. "Iine!" later served as the second single for their debut album Babymetal.

According to Blabbermouth.net, "Iine!" "combines pop with extreme metal guitars, an occasional growl or two and a tinge of hip hop". Brad Nelson of The Guardian compared the breakdown in "Iine!" to the works of Lex Luger, "down to the nervy, rattling snares".

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