i☆Ris :

• Iris (stylized as i☆Ris) is a Japanese voice acting and singing female idol group,formed in 2012 by Avex.
• It consists of six members: Saki Yamakita, Yū Serizawa, Himika Akaneya, Yūki Wakai, Miyu Kubota, and Azuki Shibuya. And their leader is Saki Yamakita.
• It was labeled a "hybrid group", because in addition to performing as singing idols, they together work as voice actresses.
• They provide the voices for main characters in the arcade game and anime franchise PriPara.

History :

• The group was formed as a result of the Anison Vocal Audition (アニソン・ボーカルオーディション) that was held in 2012 (of the six successful candidates).
• On November 7, 2012, the group debuted with its first single titled "Color" (on the label Avex). Their third single "Rainbow" was released on August 21, 2013.