Kuro no Kenja wa Kage wo Oru: Seijo Dairi wa Mou Youzumi dato Tsuihousareta ga, Kakerareta Noroi "Yami Zokusei" wa Bannou no Cheat Mahou Datta

Also known as: 黒の賢者は影を織る ～聖女代理はもう用済みだと追放されたが、かけられた呪い【闇属性】は万能のチート魔法だった～, The Black Sage That Manipulates Shadows. Or How I Was Exiled After They Were Done with Me Being the Stand-In for the Saint and Then I Got a Curse That Gave Me a Dark Attribute Magical Power That Turned Out to Be a Cheat-Like All-Purpose Magic., Kuro no Kenja wa Kage wo Oru: Seijo Dairi wa Mou Youzumi dato Tsuihou sareta ga, Kakerareta Noroi "Yami Zokusei" wa Bannou no Cheat Mahou Datta

by raku, Taruto Tatsuta

Kite, a court magician, has been putting up wards to protect the country in place of the saint. However, as soon as the crown prince's favored lady is chosen as the next saint, Kite is cursed to only be able to use dark magic and banished from the country. He is also forced to fight off a dragon that was accidentally summoned by the government... He has no choice but to start living as a hermit deep in the forest, along with the dragon he defeated... (Source: FireCross, translated)