To learn Dateken - (feat. 鏡音リン&鏡音レン) 紡唄 -つむぎうた chords, grasp the musical fabric of the song with this sequence - G, Bm, G, A, Bm and A of chords. I suggest starting at a calm pace of 84 BPM, and as you gain confidence, approach the song's BPM of 168. Given the song's key of D Major, adjust the capo to align with your vocal range and chord preference.