I love messing around with characters in VNs, so I was acquiring bad endings like candy in Halloween. I first played Unum's route then Septem's route. I then decided to play Nulla's route to see what his deal was.
*spoilers ahead*
Feeling comfortable with the power of reloading my saves, I thought it would be great to mess with Nulla by not agreeing to his deal (even though I was actually onboard with it). Well, let's just say Nulla had the last laugh by nuking 3-5 hours of gameplay. 10/10, would do again. The cherry on top was the fact that the game was backed up with Outlook cloud, so when Nulla decided to send my saves to the shadow realm, I got a notification on my phone that many of my files were recently deleted.