To learn 城南海 - (Cover) 桜 chords, your first step should be understanding these chords - C#, B, C#, F#, B, D#m and B in sequence. I suggest starting at a calm pace of 33 BPM, and as you gain confidence, approach the song's BPM of 68. Configure the capo to your vocal range and chord preference, remembering the key of F# Major.