Maron is attempting to take all of the demons because they were put there by Satan so weaken God. Soon enough a new transfer student comes named Nagoya Chiaki (-fanits- heart lol). We can of course tell, but Maron is clueless. Soon after Chiaki moves in theres a new Kaito trying to steal the paintings! This is Kaito Sinbad. (Like I said, we can of course tell that the new kaito is Chiaki) Kaito Sinbad is supposed to be Jeanne's arch enemy because Sinbad is an agent of Satan! (Later on you find out that Chiaki doesn't know hes working for Satan. Chiaki also has an angel-in-training sidekick, but this is the Dark Angel Access Time!) Chiaki is always hitting on Maron, but Maron isn't interested in low-life pick-up-artists. But she doesn't know that Chiaki is only doing this to trick her. "Its only a whim" he says. Chiaki only wants to get close to Jeanne's alter ego. (Later on Chiaki actually falls in love with Maron and she returns his love heart ) "But theres gotta be boudaries" Maron says. They're ennimies, therefore they cannot be together.
Also, the main detective on Jeanne's case is Miyako, Maron's bestfriend! Miyako wants to catch Jeanne because rumors went around that Maron might be Jeanne because they look somewhat alike. But Miyako is out to prove that they are all faulsly accusing her. (They really aren't)
Well, thats the main gist. Its so much better to have read it though! A wonderful, wonderful manga! Sorry if I went overboard with the explanation though... sweatdrop
