The official website for the currently airing The iDOLM@STER Side M
TV anime has revealed Blu-ray and DVD release information and announced that an unaired episode will be bundled with the seventh and final volume of the anime series. It will be released on June 27, 2018.
The iDOLM@STER Prologue Side M: Episode of Jupiter
, a prequel episode that aired on October 1, will be released in a separate Blu-ray and DVD volume on November 22.
Source: Official site
The iDOLM@STER Side M Special