SNAP

Upon being Heartbroken, at the bottom of the list of options, there will be a fourth option. A single word in dark, shaking letters that read SNAP.This will be added in the final game.

It's purpose is not yet known, however it's speculated to be either a revenge mode of some sort, or a small cutscene of Yandere-Chan committing suicide by snapping her own neck. (Hence the name "SNAP".)