Million Live! introduces 37 idols, working alongside the 13 idols of 765 Production; Theater Days adds two more idols and a secretary. Compared to other spin-offs in the Idolmaster series, the new idols work with and interact with the idols of 765. The general design and much of the visual elements are done by A-1 Pictures, the same animation studio responsible for animating several of the Idolmaster anime series.
Gameplay
GREE game
The game is a free-to-play idol raising simulator in which the player, as the producer, trains idols and sends them to work in various locations while also making the idols 765 Production Theater bigger. The idols are obtained through collecting cards ranked by rarity and divided into three categories, Vocal, Dance, and Visual, with a fourth category, Ex, reserved for special cards. Leveling up the cards makes the idols stronger, with the higher rarities being able to reach higher levels. The feature phone version was discontinued on February 2, 2016; a desktop client was released within the same month. The GREE game was shut down on March 19, 2018.
Theater Days
A second game titled Idolmaster Million Live! Theater Days was released June 29, 2017 for Android and iOS platforms. It is a rhythm game and simulation game, with 3D models, periodically released story missions, and multiple choice 'communication' events with the idols in the vein of the original Idolmaster games. Many of the cards from the original game are reused in Theater Days.
Media
Animations
Seven of the idols from Million Live are featured in the anime film . Special animation videos for Million Live have been created as anniversary celebrations. The first animation, a video featuring Mirai Kasuga, was created for the first anniversary and streamed in-game. A 10-minute animation was created for its fourth anniversary. Both were animated by A-1 Pictures.
TV Anime
A planned anime adaptation for Million Live! was announced during the Theater Days 3rd anniversary livestream. It will be animated by Shirogumi, directed by Shinya Watada, and with series composition and script by Youichi Katou.
Comics
Aside from comics available alongside the games themselves, Million Live! has several published manga. A manga titled Idolm@ster Million Live! was published in Monthly Shonen Sunday from August 2014 to October 2016, created by author Yuki Monji and Bandai Namco Entertainment. The collected volume editions came with original CDs.
Music
Million Live has image songs published by Lantis. The music was integrated into the gameplay of Theater Days. Sales of the CDs and concert Blu-rays had surpassed a combined one million units by 2017; the CD The@ter Generation 01 Brand New Theater! received a Gold certification from the RIAJ.
