Her first full-length album, Hitoribotchi, was then released on February 4, 2004,[2] containing many solo versions of Morning Musume songs.

[6] June 2006 saw Abe release "The Stress," a cover of the 1989 song by pop idol Chisato Moritaka.

[7] In October of the same year "Amasugita Kajitsu" was released,[8] reaching 5th on the Oricon Chart, the highest place she achieved since "Koi no Telephone Goal" in 2004.

[10] On September 15, 2010, Abe released her 12th single, "Ameagari no Niji no Yō ni" (雨上がりの虹のように, "Like a Rainbow After the Rain").

In summer 2011, Natsumi Abe was cast in the live action drama Arakawa Under the Bridge as P-ko.