Lain's Walkthrough Mod, which I was told to get for my first playthrough because it has a few expanded scenes + a scene guide. I just double checked with an unmodded version of the game and the back button does not exist without Lain's Walkthrough Mod installed. So that is the culprit.Are you using a mod or something?
At least if anyone else reports this issue we know where it comes from, what causes it, and how to solve it.
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