To learn ヒグチアイ - やわらかい仮面 chords, anchor your practice on these foundational sequence of chords - F, Cm, Dm, Eb, F, Ab and Eb. I suggest starting at a calm pace of 61 BPM, and as you gain confidence, approach the song's BPM of 123. With C Minor as the song's key, tweak the capo to cater to your vocal pitch and chord likes.