When humanity's darkest desires become monsters, one cop discovers the most dangerous monster might be himself.

Police officer Shintaro Jagasaki has a steady job, a longtime girlfriend, and a perfectly ordinary future laid out in front of him—but he's also secretly filled with violent impulses and a growing sense that his life is painfully dull. Then a bizarre rain of frogs causes people to transform into monstrous beings driven by their darkest desires, and Jagasaki discovers that his own body has changed too: his right hand can transform into a grotesque gun.

Now Jagasaki has to hunt these "Broken Humans" while struggling with the frightening power growing inside him. The more he fights, the harder it becomes to tell where the monster ends and the human begins, making Jagaaan a brutal supernatural thriller about desire, violence, morality, and the darker impulses people try to keep hidden.