I threw away the notepad, because I filled up the last few pages and typed them up.
Except the whole section was nowhere to be found. I hoped that I perhaps accidentally saved it under a different name, or even that I'd sent the updated version to kurizumaru. But the hopes were in vain.
I feared that I threw the notepad away before trash night, therefore making my work lost forever.
Fortunately, I came home from my parents' and fished it out of the trash can.
I have now backed up the file multiple times. So there! That was still kinda freaky, though.