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One of the Japanese promos calls it "Da Vinci Code meets Jurassic Park".I think that sums it up pretty nicely. It's got dinosaurs, spies, intrigue, action, and conspiracy, all rendered in lovely film noir-esque art with a little fan service cherry on top (Lily!).And for the slightly geeky, it's got cool (and sometimes obscure) references to art, literature, film, history, science... you name it. Definitely a manga for adults!
Year 20XX, strange phenomena started to occur all around Japan. The best way to explain it would be a ''hole'' that connects different worlds to our world. Many otherworldly beings - magicians, demons, robots and other fantasy creatures started to appear on this side, with no way to return. With the time passing, Japan was able to adapt to this event and visitors from another world stopped to be anything unusual. And so, an unlucky witch named Henrietta was pulled through the ''hole'' and ended in modern day Japan without a way to return. How will she be able to live in this different world?