THE IDOLM@STER LIVE THE@TER PERFORMANCE 12 is an album in the THE IDOLM@STER LIVE THE@TER PERFORMANCE series that was released on March 26th, 2014 by Lantis Co., Ltd. The theme for this album is "A Painfully Beloved Serious Unit". It features new songs and dramas by Hagiwara Yukiho, Suou Momoko, Nikaido Chizuru, and Handa Roco.
- Drama Part 1 "Drama Part 1 "765 Live Theater ~ 1 Hour Before Opening""
- Drama Part 2 "765 Live Theater Opening!"
(sung by: Handa Roco)
- Drama Part 3 "Stage Performance ~For Handa Roco~"
- Koigokoro Masquerade
(sung by: Nikaido Chizuru)
- Drama Part 4 "Stage Performance ~For Nikaido Chizuru~"
- Humming Road
(sung by: Hagiwara Yukiho)
- Drama Part 5 "Stage Performance ~For Hagiwara Yukiho~"
- Decoration Dream~in'♪
(sung by: Suou Momoko)
- Drama Part 6 "Stage Performance ~For Suou Momoko~"
- Kokoro ga Kaeru Basho
(sung by: Hagiwara Yukiho, Suou Momoko, Nikaido Chizuru, and Handa Roco)
- Bonus Drama "765 Live Theater After Closing"