The official Twitter account of J.C.Staff's High Score Girl posted an announcement video on Friday that reveals that the series will get three OVA episodes. The OVAs will streamed on Netflix in March 2019. The announcement was also made after the series' final episode that aired today.
Rensuke Oshikiri penned High Score Girl in Big Gangan from October 2010 to September 2018; compiling into ten volumes. The manga entered hiatus when it received a copyright violation for featuring characters from games without proper permission, which also delayed its anime adaptation that was initially announced in December 2013.
The anime will be available on Netflix outside of Japan in December.