simple answer: Nope.
Little things are evident. Seina marries 10 times over, 1 person still not animated. The marriages basically settle the conflicts in Renza.
Magic shenanigans.
But the details are.... hopefully... eventually... maybe... told in the novels when they continue.
At some point, Tsukiko, Kiriko's mother, leaves Earth- that's one of the stories Kajishima seems to want to tell in the next "phase." I think the two other Masaki girls, Mizune and Fuka, go with her- as they are also missing from OVA5- but their previous partner, Otoka, is actually present.