Then you're probably missing the scene with Naomi and Shanna at the secret onsen. It starts at the casino in Newkungu when you have the secret onsen discovered, and Shanna's event at Pumumu is done.
Upload it somewhere else, for example MEGA, and post the link here. (If you're on our discord server, you can send me the file there as well, without having to upload it.)
You can find the save in the www/save folder. I only need the save file with the number of the save slot, in which you have the issue.