A one episode ova with a capable band as their main catch, actually disappointed when i heard the ending song since it was so good i was actually disappointed i didnt hear it on the main series' ending songs (maybe an instrumental on some scenes on the second season but oh well). The episode features 4 members that is passionate about making a band (read the summary for more details), the girls aren't pushovers either as they actually have character traits that make them entertaining basically K-on! on one episode. Keima is still playing smart boi as He helps the girls get what they wantto get.

Conclusion, it's short and is a decent watch before going through either the sequel or the other OVA.