From what I’ve researched, they (Cinderella Girls) have more than 400 songs, so yea, that’s a fair reason to use different openings and endings for the previous episode and this one. I don’t really vibe with Idolm@ster songs, but welp, everyone has different music tastes. This episode introduced all the members, and it felt rushed, purely for introduction, with no emotional moments or special attraction to any of the idols.