Thanks Dr Kaito for such a deep analysis of the song, glad that there's subtitle I can use translation!Great work! Kaze san's chords are always so beautiful, I've learnt this beautiful chord "VI Aug/IV#" from Kaze san which appears in many of his songs, later then I learnt that it's called 'tritone'. There are so many other beautiful chords, is there any name/rule for those chords? Did you mention 'back chord'? Yes it sounds quite similar to 帰ろう, even some of the chord progressions. All the best for your 1st album, you have very good voice and sing with emotions too😊