"Tsukiyo no Shōzō" (月夜の肖像, "Portrait of the Moonlit Night") (also known by its French title "Identité de la Lune") is Japanese entertainer Chiaki Kuriyama's fifth single, released on November 23, 2011. It acted as the theme song to Himitsu Chōhōin Erika, Kuriyama's first starring drama. The two songs on the single were added to the deluxe edition of Circus, which was released on January 11, 2012. The single was produced by musician Ringo Sheena, who later covered the B-side "Seishun no Matataki" for her album Gyakuyunyū: Kōwankyoku in 2014.

After Chiaki Kuriyama debuted in early 2010 with the single "Ryūsei no Namida," she began to release collaboration singles, featuring a famous Japanese rock musician as the producer. "Kanōsei Girl" (2010) was produced by Tomoyasu Hotei, and "Cold Finger Girl" (2011) by Kenichi Asai of Blankey Jet City. In March 2011, Kuriyama released "Oishii Kisetsu/Ketteiteki Sanpunkan," a double A-side single where both songs were produced by Ringo Sheena and performed by Tokyo Jihen. This was followed two weeks later by Circus, Kuriyama's debut album.

"Tsukiyo no Shōzō" was recorded is sessions after the release of her debut album Circus, during which Kuriyama felt more confident as a singer. The songs were recorded with Sheena in the studio, with her band Tokyo Jihen performing the band instruments, with "Tsukiyo no Shōzō" recorded first, followed by "Seishun no Kagayaki." Long-time Sheena collaborator Neko Saito arranged the classical instruments.

Kuriyama felt that "Tsukiyo no Shōzō" was a song that blended "a woman's coolness and femininity" that did not emphasise sweetness or strength. Kuriyama felt that Sheena wrote "Tsukiyo no Shōzō" closer to Kuriyama's personality, after spending time together in recording sessions. She also believed it had a "strong image of women," and reflected the feelings of the character of Erika from the drama, who was a solo mother. Kuriyama felt that adding "Tsukiyo no Shōzō" and "Seishun no Matataki" to Circus gave the album more balance.

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