Tentang
Alternative names/personalities: Shuujin to Kami Hikouki: Liia Kailo (リイア カイロ)
IA is a Japanese VOCALOID developed and distributed by 1st Place Co., Ltd., and was released in January 2012 for the first VOCALOID3 engine. Her voice is provided by the Japanese female singer, Lia, known for "Tori no Uta." This song was written by Jun Maeda and used for the opening theme of the visual novel, Air.
(Source: Vocaloid Wikia)