Ro-Kyu-Bu light novel series is still not over yet! Volume 14 will be released on March 8 (
http://dengekibunko.dengeki.com/i/new.html).
The author did say he will continue to write side stories. I wonder what they will be about? I hope it takes place after the events in volume 13 and still focusing on the girls. I also wish we get to see them animated.