At the height of his exorcist prowess, Haruyoshi Kuga's insatiable thirst for power led to his downfall at the hands of jealous rivals. In his final moments, he casts a spell to be reborn, vowing to be more cunning in his next life. Reincarnated as Seika Lamprogue in a world where magic reigns supreme, he faces neglect from his noble family due to his lineage and lack of magical talent. Undeterred, Seika uses his past life's knowledge to forge valuable alliances. While honing his newfound powers, he must navigate the shadows of his past mistakes, determined not to repeat history's missteps.