A sub-unit under Aqours consisting of 3 members, Hanamaru Kunikida, Dia Kurosawa, and Kanan Matsuura.
The group was formed in 4 phases:
On December 2015, six different configurations were offered to choose from.
On January 2016, the compositions of units were officially announced, and fans were asked to submit names for them.
After 2 months, the choices for the names were revealed on March 2016.
The following month of April 2016, the official names were then announced. AZALEA's name were taken from the prefecture flower of Shizuoka, the Azalea. The definition of Azalea in Flower Language is "patient" and/or "modest", which reflects the image of the said unit.