the OVA is so much more interesting than I expected.  

My theory is that what we see in this OVA is actually what's happening while Hajime is slowly waking everyone up. This is because it's set after DR2, Hajime has some weird red stuff on his arms which will be him messing with the system, the presence of the warriors of hope, Junko's different persona and also they're actually at school. Maybe what's happening is Hajime bringing together all their hope-filled memories and stuff so they can wake up. That's what I think anyway, I could be wrong. Also Nagito and Fuyu are friends and shiz in this which is really cool....my shipping brain is on fire