[5] In April 2017, Ayaka, Miura and Kobayashi met up to discuss creating a song for a nationwide television ad campaign.

[1] Over the summer, Ayaka and Kobayashi wrote and arranged a rough demo of the song, which they then sent to Miura.

[1] On September 8, 2017, after having performed together at the 908 Festival 2017, organized by Kreva, Ayaka and Miura gathered in studio to record the vocal track and Kobayashi then completed the arrangement for the song.

[1] Ayaka describes the song as being about "overcoming the bittersweet nature of love and rising up from heartbreak".

[8] On the Oricon Digital Singles Chart, "Heart Up" debuted at number 9, with 14,000 downloads sold.