Have to say I Iike the jap version better..I loved the way they changed it up. You really could get a sense of who Sano was in it. Rather then only focusing on the romantic stuff. They gave him depth.
Mizuki's reason for going in the Jap version much better too. I love the whole tie in with Sano. In the Jap version I cared about the characters, I cried when Mizuki said all her good byes. Granted it wasn't true to the manga, but at lest it still gave you the feel of the manga. The Twa version was to slap-stick to ever be sentimental and heart felt.
Any way think the special will focus more on the romantic side of it, and bring more of the manga into it.

I hope