The official website of the Spring 2016 anime Super Lovers has announced that the tenth volume of the manga will bundle an OVA episode. Pre-orders for that volume will be accepted through October 16, 2016, and it will be released on January 1, 2017.
It was also announced last week that Ryotaro Okiaru will voice Shirou Takamura.
The Super Lovers TV anime will begin airing on April 6 on AT-X, with other networks to follow. The voice cast of the series will also reprise their roles in the new OVA, which has an estimated running time of 20 minutes.
Source: Ota☆Suke
Super Lovers OVA on MAL