|General Unit Data|
|Theater Days Pair|
BlueMoon Harmony is a unit that first appeared in THE iDOLM@STER Million Live!, which initially consisted of idols Reika Kitakami, Karen Shinomiya, Julia, Sayoko Takayama, Tomoka Tenkubashi, Megumi Tokoro, Subaru Nagayoshi, Yuriko Nanao, Chizuru Nikaido, Ayumu Maihama, Mizuki Makabe, and Shizuka Mogami. Tsumugi Shiraishi joined later in THE iDOLM@STER Million Live! Theater Days. This unit has their own CD, titled THE IDOLM@STER LIVE THE@TER FORWARD 02 BlueMoon Harmony.
BlueMoon Harmony is further divided into 4 sub-units:
- Sagittarius: Megumi, Ayumu, and Mizuki
- Pisces: Karen, Tomoka, and Chizuru
- Virgo: Subaru, Yuriko, and Shizuka
- Aquarius: Reika, Julia, and Sayoko