can't save in [Opera House]'s Sore ga Bokura no Renai Seikatsu? :/

Is it even possible to save in this game? I can't find any button on the interface to save my position, and it's driving me crazy! Is there possibly a keyboard key I'm supposed to press to save or something (google search has provided no answers)? Any help would be greatly appreciated.

Here's a getchu site if anyone needs a refresher as to what game I'm referring to:

hxxp://www.getchu.com/soft.phtml?id=30961

EDIT: eventually figured this out for myself - please delete this thread!

Im having the same problem! how did you save? ;____;