I've been listening to Persona 4 soundtrack by Shoji Meguro recently, and soon got hooked on a song called "Your Affection". It's a J-pop song whose catchy chorus intrigued me with a seemingly uncommon chord progression. (But given that I'm pretty much an amateur music lover who mostly listens to pop songs with a single I-IV-vi-V progression throughout, this might be biased haha).
According to this website (https://www.hooktheory.com/theorytab/view/shoji-meguro/persona-4---your-affection), the song is in B major, and the chord progression is:
iim7 - I6 - vim7 - V43/IV
iim7 - viim7b5-V7/vi - vim7 - V43/IV
iim7 - I6 - IVmaj7 - iii
iim7 - V7 - I - I
I googled the progression in each phrase without much finding. In general, I'm interested in if this is some variation of a popular progression (it gives me a lot of VI-I and II-V-I cadence vibe though), how the chords work together, and how they fit into the melodies.
In my limited understanding, The only thing obvious are the II-V-I cadences (viim7b5 - V7/vi - vim7 and iim7 - V7 - I) that make perfect sense, especially in the closing phrase. I also find it interesting that progressions like vim7 - V43/IV - iim7, with the G# - A (off the scale) - G# note playing, create nice tension/dissonance (and given the similarity between iim7 and IV, the resolution feels nice too), and that the comparison of the endings of each phrase, from V43/IV to iii to I, with the A - A# - B note chromatically ascending, gives a smooth resolution when we look at the bigger picture. Howver, I don't study music professionally, so I wonder if there are any underlying theories (that I miss) that summarize the techniques used here and explain why the progression sounds so amazing.