It was a normal morning, 8:30 am. Everyone was living on the surface and was happy. It had been 5 years after Sans and Toriel got married. Frisk woke up on the top bunk of his and Asriel's bed. "Frisk?"
"Yeah, Asriel?"
"Do you know where Sans is?" asked Asriel, scratching his head.
"No idea," Frisk replied. Frisk redirected his attention to the wall. His poster of everyone was on the wall but Frisk then noticed something. It looked like Frisk, but with red glowing eyes and the same t-shirt Asriel had.
"Asriel? I see someone on this poster. Do you know this person?" Frisk asked. Asriel looked at the poster and saw the figure standing in the background.
"Yeah. That looks like... wait, there's a note here." Asriel pointed out. The note was written in Comic Sans but had all three fonts at the bottom. Comic Sans, 8-Bit Operator and Papyrus. Clearly it was something important. If it wasn't important, it would be stuck onto the fridge door with a fridge magnet.