Here are what we believe to be the final unlocks for Sirius AC. Plus ratings.
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[BUBBLEGUM DANCE] Ryu* – bass 2 bass SP:4/7/10 DP:5/7/10
[EUROBEAT] Y&Co feat. Erika – IN THE NAME OF LOVE SP:4/7/9 DP:4/8/10
[J-HOUSE] kors k feat. Suzuyo Miyamoto – Special One SP:5/7/9 DP:5/8/9
[HARD RENNAISANCE] dj YOSHITAKA – Evans SP:6/10/12 DP:7/10/12
[...]

Learn how to dance like SUPER STAR 満 -MITSURU- in the comfort of your own computer room!

Almagest.

We seem to have received confirmation that the extra stage system on Sirius is now becoming accessible to players, here’s what we know:
Here’s what we know:

Once you get in, you need to collect keys for each song to unlock the extra boss song on each folder (on Normal, easy clear, Hyper, AA, and on Another, [...]

This song is on Sirius, in a cut form of course. So let us have a listen shall we?

Sirius is here, so here’s all you need to know