To start learning Gagaga Sp - Senko Hanabi chords, build your understanding on these basic chords - Eb, E, Gb, Ab, E, Gb and B in sequence. I suggest starting at a calm pace of 58 BPM, and as you gain confidence, approach the song's BPM of 116. Set the capo considering your vocal range and favored chords, aligned with the key: Db Minor.