Loading from the stadium scene talking to Saki and Aye - the party goes on until.......
OK, I've found the problem! That was the new House Show match from V.0.7.2. So, I think that maybe what might have happened is that you've accidentally overwritten your prompt save from the final stadium event in V.0.7.0. (this is where you're told that you're almost at the end of the current version and you should save your game now).
Do you have any save from just before that final event, or even a copy of the prompt save? If so, you can load either of these and you should be able to jump into the new content without any problems.
If not, there are a couple of easy fixes for it but I'd need to send you a file. If you can email me an address I can send it to, I think we can get this solved pretty quickly for you!