39

Background
This song was uploaded in celebration of Miku's 5th birthday. The song is about Miku giving thanks to all her listeners, people who use her, and just any overall fan of Vocaloid in general for sticking with her for this long.

This song was released as a single and is featured on the albums MIKU-MIXTURE, Hatsune Miku 5th Anniversary Best ～memories～, Hatsune Miku 5th Anniversary Best ～impacts～, and Hatsune Miku "Magical Mirai 2014" Official Album.

Advertising
"39" was featured in a FamilyMart commercial in 2012.

Concerts
This song was featured in the following concerts.

Trivia

 * "39" is a number often recurring in the VOCALOID franchise because it can also be read as "Miku".
 * In this song, "3-9" can also be read as "San-Kyuu." When spoken with an accent, it sounds like "Thank You" in English.
 * In the PV of this song in Project Diva Arcade, during the final 1/3 of the song, the venue is simular to the site for Miku no Hi Dai Kanshasai 39's Giving Day in Tokyo Hall City Dome in Tokyo, Japan.