RIAJ Digital Track Chart
After Kimura sung the song at the annual New Year's Song contest, Kōhaku Uta Gassen, the song saw a great spike in sales. Before the performance, the song had been being downloaded roughly 1,500-2,000 times per day, which spiked to 40,000 times per day afterwards. Because of this, on 5 January, the song had been downloaded a total of 2,000,000 times. This also caused "Butterfly" to reach the #1 spot on the RIAJ Digital Track Chart for two weeks.