The 5th song added to the series, "Nana Nana★Fever Miracle Tonight" is sung by an UTAUloid, Mitani Nana (実谷ナナ). This is the first and only song samfree has made using UTAU. Some people even criticized that this song is not good enough to be in the series.
The 6th song added to the series, "Niku Niku★Takagix Night" was released on the CD "Plustellia" on 15th August 2010. The song is sung by Luka and Takagix is one of samfree's friends.
The 9th song added to the series, "Miku Miku☆Summer Night Fantasy" was first revealed on samfree's album "Crime". samfree did not upload it to Nico Nico Douga.
The 12th song, "Teto Teto☆in the Wonder Night" sung by the most famous UTAUloid, Kasane Teto was released on an UTAU specific CD, "0401-The Best Days of 重音テト" (Kasane Teto).
Songs in the series:
- Luka Luka★Night Fever
- Taku Luka★Maguro Fever
- Megu Megu☆Fire Endless Night
- Miki Miki★Romantic Night
- Nana Nana★Fever Miracle Tonight
- Niku Niku★Takagix Night
- Lily Lily★Burning Night
- Neko Neko☆Super Fever Night
- Piko Piko☆Legend Of The Night
- Miku Miku☆Summer Night Fantasy
- IA IA★Night of Desire
- Teto Teto☆in the Wonder Night