...Well, that title's pretty unrevealing. The bit before the OP blathers on about some miracle, with some shots from everyday life, and the one of Hazumu crossing the river again for Tomari from the bit after the ED from Twelve. They do that several times throughout the episode, actually The OP itself is a full version of the opening, with the normal OP animation and a recap of the series. The OVA gives us a nice little check-in with just about every character who appeared in the series at some point or another. Apparently, it's been four months since the end of the series. Asuta and Hazumu's father haven'tchanged one bit, and neither has Namiko-sensei or Ayuki. xD

Apparently, Hazumu's adjusted well to being a girl, and accepted it.

But things don't seem to be okay with Tomari; she's giving Hazumu the cold shoulder, and doing training sessions in the morning instead of walking to school with the group, and it has something to do with that little bit after Twelve's ED, which was a confession from Hazumu.

Yasuna, on the other hand, seems to have come out of her shell, which is nice. Apparently, the little bit after the ED of Twelve was her saying that she's okay if Hazumu isn't constantly by her side, and that she wanted to walk alone... which means that she broke up with him, because she feared become too dependent on him. YES!! (dances) They seem to have made the transition to friend well -- then again, there wasn't much of a relationship there to begin with.

Apparently, she, Ayuki, and Asuta planned setting up Tomari and Hazumu with the space-man, which involved kidnapping Tomari, and Ayuki and Asuta being Santa and a reindeer, respectively.