Story Related in chapter 7;
First mini game of the chapter requires breaking gourds through timed button holds and mashing a button in between. Time the press and hold to release for the second icon, complete these to build a bar at the top of the screen until it hits a gourd. You'll then be given a button to mash to break the gourd, points are given on accuracy for rhythm game, number of gourds broken and time remaining.
Points are shown at the side as you earn them and you'll need about 6500+ for an S-Rank.