I have only read Kick-Ass a few days ago, though I did see the film when it came out on DVD. I picked the collected edition of Hit-Girl up from my library at the same time. This is a continuation of the story from Kick-Ass, as Mindy McCready has to take on her toughest challenge yet, going to school and not kill anyone. Well, not anyone there anyway, as she has taken up moonlighting as Hit-Girl - "I was just laying low until the heat dies down", taking down the new Mafia family which is now under the control of the brother of John Genovese while also training Kick-Ass, in exchange for him training her to be a teenage schoolgirl. Since Mindy doesn't leave witnesses, the Mafia think her step-father is behind the attacks on their organisation, as he is the most senior honest cop on the force, so they come looking for him and his family. Unfortunately, Mindy has just drugged her parents so she can go out on the town. Meanwhile, the Red Mist is annoyed that he has been upstaged as head of the family, in a Hamlety-like way, so he sets out to start his super-villain career. Unfortunately, he doesn't have the training to take on angry Asian shopkeepers, so after recovering from a severe beating, he does the only sensible thing and goes off to ninja school in a faraway land, to prepare himself for Kick-Ass 2. Kick-Ass himself manages to break is hand part-way through, so Mindy has to sort everything out for herself.
Anyway, this is an entertaining comic book if you like well-told graphically violent comic books, though one has to wonder how long it will be before someone blames mark Millar for the next high-school massacre.