I am analyzing the music of [Name of Life arranged by Makiko HIroHashi] (https://musescore.com/user/4622501/scores/5038709).
From measure 29 - 30 it goes from :
(First half Measure 29 ): Eb minor [ii] (second half Measure 29): Eb major [II] (Measure 30): Gb major [IV]
I was wondering why does the II -> IV work? Is it some type of augmented6th chord, secondary dominant, or enharmonic progression that I am not seeing?