Finally got the chance to read this one!
This is exactly what the title says it is: Ghostbusters II, but in the art-style of the Real Ghostbusters, the animated series that followed the 1984 film.
It plays out almost the same as the movie (some language included) but even includes the deleted scene where Ray is possessed by the spirit of Vigo and crashes the Ecto-1A into a tree.
It's a lot of fun, and a real treat for fans of both the movies and the animated series.
Recommended (if you can get your hands on a copy).