Living in poverty in a dangerous, walled-in city trapped in a post-apocalyptic world didn't give Rain much to live for besides taking care of his small family by working at hard and sometimes disgusting part-time jobs. When he makes a sacrifice made for a childhood friend, he unwittingly finds it leads to the opportunity to become an agent of the high-tech secret society known as The Vincent. Before his training is even complete, Rain finds himself in over his head with danger at every turn. Armed with nothing but long-term amnesia, a clever mind and wry sense of humor, Rain must do everything in his power to prove he has what it takes to become a Vincent agent—all while simultaneously outmaneuvering a malicious spy.