Before anyone asks about OVAs I and II, they’re both recaps and Ametuchi didn’t want to translate them (all I remember of them was a skit with Gablae in drag). OVA III on the other hand, is a sidestory type thing. It’s set some point in the first half of the series, and is mainly focussed on Leccee. As in there is a lot of pandering to Daba-Leccee shippers. Plot itself involves family duty, HMs designed in a competition, 80s Basara and probably the most unfortunatly named mecha for some time.
And as an extra, have the soundtrack for this OVA
Also as a side thing, it’s almost the 4th anniversary of /m/subs being founded. (Anniversary is the 27th)