https://twitter.com/SideM_lantis/status/1944382374990455045
New unit CD series: THE IDOLM@STER SideM ~P@SSION CHALLENGE We are 315!~ MONTHLY THEME SONG
Contains a new unit song, its solo versions, and the Off Vocal version.
The first CD will be S.E.M, to be released on November 26th.