Su Yu, a corporate worker from Blue Star, transmigrates into the body of Rein Gray, an eighteen-year-old noble scion of House Gray in the Ecisia Empire. Upon awakening, Rein finds himself kneeling before Sophia Ward, a Rank 2 Intermediate Knight prodigy, having just publicly proposed to her. This act triggers the wrath of his father, Fude Gray, a Rank 6 Luminary Knight and the head of one of the Empire's most powerful marquis families. The proposal is not merely a romantic gesture but a political misstep that threatens to upset the balance of power between House Gray and House Ward, drawing the suspicious attention of the Emperor. Rein, initially confused by the situation, quickly adapts to his new reality as he absorbs the memories of his predecessor, a rogue noble known for his eccentric and disruptive behavior.
Rein discovers that the original host lacked talent for Battle Qi, the dominant cultivation method in this world, but possessed an unprecedented all-attribute magical talent. However, due to the Dharma Decline Era, where magic is nearly extinct, there are no meditation methods suitable for his gift, leaving him powerless. His fate changes when he realizes a mysterious necklace he wore on Blue Star has traveled with him. This artifact, revealed to be the Book of Arts, appears in his consciousness as an ancient tome capable of recording all cultivation techniques and granting sudden enlightenment upon learning new skills. Rein exchanges the book for the Abyssal Meditation Method, a world-class technique that matches his talent, and rapidly advances from a magic apprentice to a Rank 1 Junior Mage. He also learns to conceal his true strength using Silent Magic.
To address the political fallout, Rein's mother, Leila, arranges a betrothal with Adele Hill of House Hill to forge an alliance and distance House Gray from House Ward. Meanwhile, Rein faces a personal challenge from Damon Mick, a Rank 1 Intermediate Warrior and the primary suitor for Sophia. Damon challenges Rein to an honor duel, which Rein accepts. The Mick family, seeking to boost Damon's reputation, rigs the duel by gifting the academy Anti-Magic Stone equipment, which severely suppresses Rein's magical abilities. Despite this disadvantage, Rein prepares by absorbing magical artifacts from his family's treasury to recharge the Book of Arts, acquiring new spells and techniques.
On the day of the duel, Rein arrives late, accompanied by his maids, drawing mockery from the crowd. In the arena, Damon wields the Anti-Magic Stone armor and weapons, confident in his victory. Rein, however, reveals his trump card: Instant Casting, a rare arcane secret that allows him to cast multiple spells simultaneously without the usual incantation time. He summons countless spectral light spears above the arena, overwhelming Damon and shocking the spectators, including the academy's faculty and the heads of the noble families. The duel showcases Rein's true potential as a mage, turning the tide against the Mick family's schemes and establishing him as a formidable force in the Empire.
