It's just a special bonus episode, but... ***WARNING: SPOILERS*** anyways.
Story: 7/10
Didn't particularly care for the story in this episode but I understand that as a special you can't really have a complicated and deep plot.
Art: 9/10
It was great as usual.
Sound: 4/10
Yeah... sorry but I cringed a lot at the voice actors' attempts to speak English. It was difficult to take them seriously because it was just... too thick of a Japanese accent. They need to work on their English I guess :P
Character: 8/10
I found it really cool to see the future mother of Suzuha :D
Enjoyment: 6/10
Not a whole lot happened in it, was a little bored aside from a few parts.
Overall: 7/10