Watashi ga Obasan ni Natte mo

Moritaka wrote "Watashi ga Obasan ni Natte mo" when she was 20 after being told by male staff of her management that women reach their prime at age 19. The song describes a woman's wish for a man to accept her, regardless of her age.^[2][3][4][5] It partially draws inspiration from The Beatles' "When I'm Sixty-Four".^[6]

The song was used as the opening theme of the NTV drama series Matta Nashi! (まったナシ!; Total Pear!^{[citation needed]}). Moritaka wrote the lyrics for the B-side "Jitensha Tsūgaku" (自転車通学; lit. "Bicycle Commuting"), based on her experiences commuting to school by bicycle.^[4]

No music video of the song was made at the time the single was released, but in 2001, a re-edit of the song performance from Moritaka's 1993 live video Live Rock Alive was included as a music video in the DVD Chisato Moritaka DVD Collection No. 15, which was a mail-in order exclusive for those who purchased the first edition release of DVD Collection Nos. 1-14. On June 25, 2022, Warner Music Japan uploaded a remastered version of the music video on Apple Music to commemorate the 30th anniversary of the single.^[7][8]

"Watashi ga Obasan ni Natte mo" peaked at No. 15 on Oricon's singles chart and sold 228,000 copies, and has since become one of Moritaka's most popular songs.^[9][10] It was also certified Gold by the RIAJ in December 1992.^[11] During the 43rd Kōhaku Uta Gassen, when Moritaka was part of the Red team, host Hikari Ishida introduced the song as "A song that gave all women the courage!" (すべての女性に勇気を与えた歌です！, Subete no josei ni yūki wo ataeta uta desu!).^[2][12][4]

In his 2019 article, music journalist and blogger Tomonori Shiba noted that the song symbolized a shift in women's attitudes during the Heisei era.^[13]

Moritaka's 2013 live album YouTube Public Recording & Live at Yokohama Blitz features "Aru OL ga Obasan ni Natte mo" (あるOLがオバさんになっても; lit. "Even if an Office Lady Becomes an Old Lady"), with the lyrics of this song performed to the tune of her 1990 song "Aru OL no Seishun ~ A-ko no Baai ~ (Moritaka Connection)".

The song was remixed by tofubeats in the 2014 collaboration album Chisato Moritaka with tofubeats: Moritaka Tofu.^[14]

In 2015, Moritaka re-recorded the song for a series of Kosé cosmetics commercials she starred in.^[15] This version, titled "Watashi ga Obasan ni Natte mo (Slow Version)" (私がオバさんになっても（スローヴァージョン）) was included in her 2017 self-covers DVD album Love Vol. 10.^[16][17]

In 2019, she performed a brief a cappella version of the song in a commercial promoting DHC Queen of Serum anti-aging skin cream.^[18][19][20]

• Chisato Moritaka – vocals
• Hideo Saitō – all instruments, programming, backing vocals