If you say no the Devil he will say
“Welching on me just like all the others, eh…I’ll teach you for backing out of a deal; have at you!!”
Then you will start a hard boss battle with the Devil. If you beat him, The Devil Himself baby will surrender. The brothers will then burn all the contracts releasing all the souls the Devil has collected.
If You say yes to the devil
Cupman and Mugman are Transformed in Demonic versions of themselves the Devil states they are going to have “One Hell of a Time.” then credits will roll once the scene is done.