For a long time, monsters on the Island have coveted the chance to wipe out the human world. Today, the heir to a wealthy family and high school teacher, Won Mi arrived on the Island, immediately regarded as prey of the monsters. The only people who can save her are the mysterious monster hunter Ban and exorcist John who was sent by the Pope's office. The three people would never have been able to get along, but they must unite to fight the monsters, as without their efforts, evil will surely destroy the world