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 remanning members graduated.

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

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)