>>713591310
The plot is this: 13 years ago evil lesbian witches tried to sacrifice a virgin to the devil but fucked it up and all got killed instead, their victim made a deal with the devil instead and got magic powers but would go to hell 13 years later. She now wants to switch her soul into a new body to escape this fate.
YOU are Minase Taki, a dumbass whose childhood friend Imari is head of the school art club. You find a black magic grimoire in the school basement and end up using it irresponsibly.
What happens past this point depends on your choices.