What is "ceui"

Ceui (born January 31) is a Japanese singer–songwriter originally from Chiba, Japan, though she grew up in Fukuoka. Ceui's name is derived from the Portuguese word for sky, céu. She has been singing since 2000, but made her major debut in 2007 singing the ending theme for the anime series Shattered Angels, and since then has done songs for other anime including Sola, Sora o Miageru Shōjo no Hitomi ni Utsuru Sekai, Sora Kake Girl, and Aoi Hana. She has released eleven singles and released her major debut album Glassy Heaven on July 22, 2009.