Hmm...
I don't see any problem with the OVA being based around the EX girls, mainly Saya and Sasami (Haruka's twin could be done along with Haruka)...or not even based on any girl, how about an OVA about the guys? I'd love that! I love Kengo and Masato, LB is nothing without those two! Hell just based an episode around the muscle route! Or make up a new story for the OVA around the 4 LB guys in their quest for wasting time!
Randrak