About “Aki Sora”
Aki Sora is a Japanese manga series written and illustrated by Masahiro Itosugi, first published in September 2007 by Akita Shoten in the seinen magazine Champion Red Ichigo. Two OVA adaptations were produced by Hoods Entertainment and Pony Canyon in 2008 and 2009 respectively. (Summary adapted from Wikipedia, CC BY-SA 4.0.)
Some summaries adapted from Wikipedia, CC BY-SA 4.0.