The film is set in the village of Nomen Tuum (
Latin, "your name"), which has a well that can heal the sick and make a person more beautiful. Because of the latter, many conceited or corrupt individuals come to the village for this cosmetic effect. The village has notoriety for its magical water, as well as being a ground for darkness and
demons. Along the village,
succubi entice the tainted souls who come to Nomen Tuum and lead them to their deaths in order to offer their souls to
Hell/the God of Darkness. A prominent young succubus named Kia loathes the routine of herding sinners to hell. Kia claims her powers are being wasted, and needs something/someone more stimulating as her prey. Her sister succubus, Amael, warns Kia of the danger that a pure soul will bring: love. Kia persists anyway and attempts to find a clergyman to seduce into darkness. After watching their behaviour, however, she realizes these men are just as iniquitous and shrewd as her previous victims. She soon stumbles upon a suitable victim: Marc, a young soldier, who with his sister Arndis. comes to the sacred water in order to heal his battle wounds. Kia then continues to follow the siblings and pretends to be lost. After a brief eclipse, Kia convinces Marc to accompany her to the sea. During the eclipse, Arndis becomes blind from looking into the sky. Disoriented, she stumbles around in order to find Marc. Marc and Kia quickly become attracted to each other. Marc will not have closer relations with Kia unless they marry. As Kia sleeps, Marc takes her to the village cathedral. Kia flees from the cathedral, bewildered by the sight of Christ and the saints. She is repulsed by both the Godly images and Marc's pure love. His purity makes her ill. Amael and Kia meditate revenge on Marc for "defiling her" with an "act of love". Amael summons an
incubus that attempts to kill Marc and rapes and murders Arndis. As Marc prays for his sister, he makes the
sign of the cross and the lurking demons cringe in horror. Defending himself from the incubus' attack, he appears to have killed him and Amael tells him he has the sin of murder on his hands. Kia follows Marc, who is dying, to the cathedral where she professes her love for him. The
resurrected incubus intervenes and claims she belongs to the God of Darkness. Kia defies him and makes the sign of the cross, surprising even herself. The incubus transforms into a goat and wrestles her to the ground. After the struggle, she says "I belong to the God of Light," and crawls toward Marc, who immediately embraces her. The final scene shows the couple staring in disbelief at the boundary of the cathedral, with the goat gazing back at them. == Cast ==