Harmony Day

is a song by Morfonica.

It is the title track for their 3rd single, with Sonorous as one of the coupling track. It will be released on October 6, 2021. The limited Blu-ray edition will include both BanG Dream! 8th☆LIVE Summer Outdoors 3DAYS Day 3: Special Live ~Summerly Tone♪~ (Morfonica PART) and Cantabile.

It is the gift song for the event Einsatz of a New Journey.

It was written by Oda Asuka, and arranged and composed by Fujima Hitoshi.

Live Performances

 * February 23, 2021: Astral Harmony
 * May 21, 2021: Andante
 * September 4, 2021: Mythology Day 1