According to Amazon Japan, an OVA will be released for the anime "Hidamari Sketch
", adapted from the manga of the same name
, and will cover the story of Sae and Hiro's graduation. The OVA will have two episodes, one for the examination and one for the graduation, and will be released on November 27th.
Source: Amazon http://www.amazon.co.jp/gp/product/B00ESY3FD8
Hidamari Sketch: Sae Hiro Sotsugyou-hen