Hi. I don't know if you've already solved the first bug, but I have some info on this one and a few other issues.
1. Regarding the first bug, I think it's a normal one. I also encountered this problem, and I noticed that it only occurs if I don't talk to Kunio for the entire level, then, in a conversation with Okada, choose the option where Masuo says she mistook him for someone else, and only then talk to Kunio. If Masuo chooses a different option in the dialogue with Okada, or talks to Kunio before talking to Okada, this problem doesn't occur.
Also, if you talk to Kunio, then complete the level, start new, and follow the path that leads to the bug, it will also occur. (I'm not sure if this part is worthwhile, but it theoretically eliminates the safe file-related errors, so it might be a good clue. Or maybe it's just that after programming in C++, my brain is trying to find any possible cause for the error, no matter how absurd, haha.)
2. I noticed that there's a strange error related to Masuo's dialogue during the scene with Okada and Ms. Yamada in the classroom. Masuo should say this line, but instead he says nothing, like in the first bug(Unfortunately, I couldn't reproduce the scene or find a screenshot of this problem, so I'm attaching what the correct phrase should look like):
Unfortunately, I couldn't find any clues to solve this error :(
I'm not entirely sure how exactly the game decides which of the two scenes to run, so I couldn't constantly check it. Also, surprisingly, this line only appeared the first time I played it, and then, if I'm not mistaken, there was only a blank space from Masuo.
3. Also, I don't know if this is a bug. However, I noticed that while I'm in the college area, Divine Petals are constantly being added, every second or so. It's possible that the issue is that my save was ported from version 0.3.1 to 0.3.2.1, as this problem didn't exist in version 0.3.1. By the way, I just remembered that you've released a newer version of the game, and perhaps the issues I described are no longer relevant. Sorry if that's the case