To start learning Tuyu - アンダーキッズ chords, centre your learning around these elemetal chords sequence: Ab, F, Bbm, Gb, Cm, D, Gm, D, Db and Cm. A strategic approach would be to train at 56 BPM initially, and then accelerate to the song's tempo of 112. Align the capo with your vocal depth and chord choice, bearing in mind the song's original key: Bb Major.