Night Series

The Night Series, more notably known in Niconico as the SAMナイトシリーズ (SAM Night Series), is a series of songs by Samfree and illistrated by HaruAki. It is currently made up of 13 songs sung by various VOCALOIDs/UTAUs. Only nine of them have been uploaded, with the other five being featured in albums.

Not involved with Night ∞ Series

Background
The Night series is a a group of Eurobeat songs composed by Samfree. The songs are characterized by sharing the same pattern or rhythm, a similar title style (the VOCALOID's name repeated two times, a star and catchy phrase with the word "night" in it.) and being released shortly after the debut of a new VOCALOID. In fact, it's almost a tradition for some of the new released Japanese voicebanks to receive a song, as a welcome to the newcomer.

ミク ミク☆サマーナイトファンタジー (Miku Miku☆Summer Night Fantasy)
Sung by Hatsune Miku, it was featured on the album Crime The ninth song in the series.

ニクニク★タカギックスナイト (Niku Niku★Takagi's Night)
Sung by Megurine Luka, it was featured on the album Plustellia The tenth song in the series.

テトテト☆インザワンダーナイト (Teto Teto☆in the Wonder Night)
Sung by Kasane Teto (UTAU), it was featured on the album 0401 - The Best Days Of Kasane Teto The eleventh song in the series.

ギャラギャラ☆スペシャルハッピーナイト (gala gala☆Special Happy Night)
Sung by galacoit was featured on the album galaco SUPER BEST The twelfth song in the series.

Trivia

 * "Nana Nana★Fever Miracle Tonight" and "Teto Teto☆in the Wonder Night" are the only 2 songs to be sung by UTAUs.
 * "Piko Piko☆Legend of The Night" is the first song to be sung by a male VOCALOID.