The unit was formed by Annabel, Nagi Yanagi, Yoshihisa Nagao, and xai in May 2006.
Its main composer Nagi Yanagi is also famous for her anime theme song works, including Waiting in the Summer (2012), AMNESIA (2013), Nagi no Asukara (2013-2014), and the ongoing Berserk.
The CD single of “Kamiiro Awase” will be released on August 3.