Edda est un jeune homme dont la vie tranquille sur une ile ennuyeuse est un jour bouleversée par Kirika, une jeune femme mystérieuse rencontrée sur la plage. Lorsqu'il découvre soudainement ses pouvoirs d'exorcisme, il devient chasseur et se retrouve plongé dans une grande aventure qui oppose la nature à la civilisation.
Voir la description anglaise
Arc the Lad: End of Darkness takes place five years after, yet in the same world as Arc the Lad: Twilight of the Spirits. Players take the role of Edda, a young man whose youth is marked by a "boring island life". His serenity is shattered, however, when he meets Kirika, a rude young woman, on the beach. Shortly after, Edda tries to help a hunter capture vicious criminals, but the latter gets killed. Edda notices Kirika standing nearby, and his suspicions begin to grow about the mysterious young woman. Edda who has awakened as a full-fledged exorcist becomes a hunter himself, and realizing a sense of responsibility to save the weakened world, he sets out on a remarkable journey that will ultimately pit civilization against nature.