The second part of the anime adaptation of the popular manga "Aki Sora" by Itosugi Masahiro, released in 2010. You can find the first part here. Also on the site you can find a fan service compilation of two OVAs. 

 

 

This series will show us a touching story of forbidden love between brother and sister. What awaits our heroes, how will it all end? Watch and find out for yourselves. Since childhood, Aki, whose name can be translated as «autumn», and Sora — «sky» — were very close. But with age, their relationship became more calm, proper for relatives. But feelings are feelings, you can't hide them, even when you love a relative.