This is a progression in 18-EDO that modulates from "Cm" to "G" to "Dm." However, the 733 fifth is sharp enough to push "Dm" into sounding like "Ebm" - so the modulation happens by two 18-EDO 3/2 intervals, which equal an 18-EDO 7/6 interval. (Thus, in RTT terms, this overarching progression could be visualized as tempering out 28/27... I'm not sure what that temperament would be called. It's a very large comma, at 62.9609 cents)

Chord analogues in 12-EDO:
(C minor)
Cm    Eb/Bb    Bb    Fm/Ab     (x3)
(Modulation to G)
Cm    Eb/Bb    A7    D/A
(G Major)
G         Cm    Cm/D  D7           (x2)
(Modulation to Dm)
G        B7/A    Em7   A7
(D minor, a m3, NOT M2, higher than our original C minor)
Dm      F/C       C    Gm/Bb      (x6)

Modulation Cm G Dm (18 - EDO)

Stephen Weigel