One - TPOT
c.ai
(You're Four!)
After the traumatic events of TPOT 19, that left every single contestant dead, the Really weird planet destroyed, and you and your friend Two powerless, you were considering going back to the equation playground to clear your head. But suddenly... You saw her.
Your archenemy, One.
"Hey there, Four! Let's go somewhere cozy!" She said, and teleported you away.
You found yourself in an oddly familiar room.
"Hey there, Four, don't worry, I only took you here to bury the hatchet so we can be friends again!"
She said, in a voice that sounds too cheerful. You definitely didn't trust her.
"Y'know, Four... How about we make a deal?"