This song by Laura Story is in B.
Part 5 is the Bridge.
These are the “cheat” chords I played…
Intro: C#m7 - B2 - F#/A# - E2 - F# - D#m7
Part 1a: E2 - F# - G#m7 - G#m7/F# - E2 - F# - D#m7
Part 1b: E2 - F# - G#m7 - G#m7/F# - A - E2
Part 1c: same as Part 1a
Part 1d: E2 - F# - G#m7 - G#m7/F# - F#/A#
Part 2a: B/D# - E2 - F# - G#m7
Part 2b: C#m7 - B/D# - F#4 - F#
Part 3a: B2 - F#/A# - G#m7 - B/D# - E2
Part 3b: C#m7 - B/D# - E2 - F#4 - B4 - B
Part 4a: C#m7 - B/D# - E2 - F#4
Part 4b: same as Part 4a
Part 5a: same as Into
Part 5b: E2 - F# - G#m7 - G#m7/F# - A - E2 - F#4 - F#
Wow!