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 a…
Think of it as 6/5 and you've got father, and when (3/2)^2=6…