Paul is a foreigner living and working in Japan with his Japanese girlfriend, Naoka. Tired of mundane office life, he quits his job to apply for a new career at the MRA (Monster Removal Agency), an organization that hunts predatory Monsters in Japan. After a brief interview with the MRA's Tokyo chief, the mysterious Mr. Morimoto, Paul endures intense physical training to prepare for battle with his deadly foes. But when Naoka doesn't take kindly to the news of Paul's career change, he must begin his first mission wondering whether or not Monster Hunting is really the job for him.