The Idolmaster SideM

The Idolmaster SideM (Japanese: アイドルマスター SideM, Hepburn: Aidorumasutā Saido Emu, stylized as THE iDOLM@STER SideM) is a Japanese multimedia spin-off series of The Idolmaster, starting with a 2014 game and expanding to include music CDs, two anime series, a web radio show, printed manga, and a rhythm game. The series focuses on the male idols of 315 Production, in contrast with the normally female idol centric series.

The original game was published by Bandai Namco Entertainment and developed by Alt Plus Inc. was released on the Mobage platform in 2014. and is a male idol raising simulation game. A second game, a rhythm game developed by Akatsuki, was released in August 2017. An anime adaptation by A-1 Pictures aired between October and December 2017, and a second chibi slice of life anime adaptation of a manga, animated by Zero-G, aired from October to December 2018.

On October 6, 2021, THE iDOLM@STER SideM GROWING STARS, a spinoff rhythm game, was released for Android and iOS. On April 4, 2023, Bandai Namco announced that the game will end its service on July 31, 2023.

On November 4, 2022, Bandai Namco announced that the Mobage game will end its service on January 5, 2023.