Aiiro Asterism

 (藍色アステリズム) is a five-member Japanese idol group originally formed with seven members in March 2018.

They made their stage debut on June 4, 2018 @Toyosu PIT.

They went inactive on December 30, 2019, where the remaining members graduated.

They revived the group on March 5, 2020, with five new members.

The new system debuted on March 9, 2020 @Shinjuku KeyStudio.

Current Members

 * Shirosaki Himari (城崎ひまり; ) (Joined March 5, 2020) Leader
 * Otonashi Nori (音無のり; ) (Joined March 5, 2020)
 * Haruta Ayaka (春田彩花; ) (Joined March 5, 2020)
 * Aino Kotoe (愛野琴都恵; ) (Joined March 5, 2020)
 * Takanashi Mao (高梨真緒; ) (Joined March 5, 2020)

Former Members

 * Miyama Rin (深山凜) (Founding member; graduated on October 25, 2018)
 * Satou Mei (佐藤芽衣) (Founding member; graduated on May 28, 2019)
 * Nishitani Iori (西谷依織) (Founding member; graduated on December 30, 2019)
 * Kurata Moka (倉田もか) (Founding member; graduated on December 30, 2019)
 * Sakuragi Kasumi (桜木花純) (Founding member; graduated on December 30, 2019)
 * Hoshino Aya (星野彩) (Founding member; graduated on December 30, 2019)
 * Watanabe Mio (渡辺美碧) (Founding member; graduated on December 30, 2019)