Okitegami (置き手紙; A Letter Left Behind) is Fujimoto Miki's sixth and final single. It was released on April 23, 2008, and it was her first single since retiring from Morning Musume. It peaked at number twenty-nine on the Oricon charts and sold 24,746 copies overall. It is her longest charting single, with twenty-one weeks, but also her lowest selling and lowest ranking.
Horiuchi Takao also released his own version of "Okitegami" at the same time as Fujimoto Miki's version. Fujimoto's response about this was that she was looking forward to the chart battle with him. She also added: "This song was really difficult. It was different from what I used to sing until now, so please look forward for this new Fujimoto Miki. My mom told me not to cause any trouble to Horiuchi-san." They both later did a duet of the song on the show The M, with him singing the first half, and her singing the second half. This is the same marketing gimmick used by UP-FRONT AGENCY for Nakazawa Yuko's release of Junjou Koushinkyoku, as well as ℃-ute's release of Edo no Temari Uta II.
"Okitegami" is Fujimoto Miki's first enka single. At several forums, it was speculated that the single was originally intended for enka singer Maeda Yuki, as she released one single per year except in 2008. Some also speculated that maybe it was originally intended for Nakazawa Yuko, as she performed it live at one of her birthday events, and the composer was the same one who worked on her debut single.
Fujimoto appears in Horiuchi Takao's music video for his version of the single.