Many genocides before over and over again, the humans was encounter with the Abydos students for the first time, but instead they meet an old friend who didn't need backup.

He's gotten sick and watching the human killed by many people over and over again, the humans was starting a genocide route and the lvl is 25, sans was impatient, he didn't want to see the death of the people he loved, so he stopper everyone for need to attack, and took care of himself to get hit and reborned.

But he died, and Serika was the one who watches all of the people die in vain.