The Book of Purgatory is a comic adaptation/reinterpretation + crossover story between classical works of literature, depicting the stories themselves, and what could have happened after their endings. At the forefront of this story is Doctor Faust, and his demonic companion Mephistopheles.
Faust falls in love with a young lady, so now Mephistopheles has another task to work on.
Some quotes are directly from the Kaufmann English translation of Goethe’s Faust.