Sola is a Japanese work originally conceived by Naoki Hisaya (main writer of Kanon) with original character design by Naru Nanao (designer of D.C.: Da Capo). Sola is a mixed media project, first unveiled through the prologue of the manga featured in the Japanese manga magazine Dengeki Daioh on December 21, 2006, published by MediaWorks. The manga, which is illustrated by Chako Abeno, ended serialization on February 21, 2008. The manga has been licensed for distribution in North America by Broccoli Books with the first volume being released in June 2008. A short drama CD which also served as a prologue to the series was released at Comiket 71 on December 31, 2006, and another longer drama CD was later released in August 2007; a second drama CD was released in May 2008. An anime version aired in Japan between April 7, 2007 and June 30, 2007; the anime contained thirteen episodes, and two additional DVD-exclusive episodes followed. The anime was licensed by Bandai Entertainment for distribution in North America in a subtitle-only box set of all fifteen episodes. The title, Sola, is close in pronunciation to the Japanese word sora (空, sora? lit. "sky"), and homophonic to the Spanish word sola, meaning "alone". At the end of 2007, Japanese anime fans voted Sola as the best anime of the year.

Source: Wikipedia