I haven't read it all, since I haven't had the time to yet, but one thing I quickly saw.

After Natsuki's first player-kill, she was forced to live in hiding until her Color Cursor returned to a green color

It has been stated, by the author, that player killing makes a player PERMANENTLY have an orange cursor color. That is that they instantly become a "red" player.

Edit:
Yeah ... people wanted katanas .... so we were lenient on that part