There ain't even a romance tag, dawg. You can just quit with this nonsense.
Actually, it's not even a gender bender. This is a monster who became human.
Actually actually...I hope it IS yuri just to piss you off, lol.
Finally, a comprehensive explanation on what the villainess system was. It was the world trying to force the original timeline back into its original state.
Curiouser and curiouser. Percentage boxes with a person who keeps repeating the timeline to avoid a fixed bad ending, eh? First thing that comes to my mind is a certain skeleton, but then again, I've never read or watched Stein's Gate.