Yuuto Nagashima, once feared as the mighty Demon Lord, found himself facing his perennial rival, Yugi Yuuru, the heroic figure who matched his strength. Over the course of three long years, they had clashed in battle multiple times, resulting in stalemates. Wearied by the repetition, Yuuto received Yugi's latest challenge and begrudgingly prepared for yet another confrontation.

As the clash ensued within the confines of Yuuto's imposing castle, an unsettling premonition loomed over him. Ignoring the feeling momentarily, he engaged Yugi in combat. However, this time, something was different. The impending battle felt weighted, as if the outcome would be more profound than before. Nevertheless, Yuuto remained nonchalant, indifferent to the value of his own life. Having existed for over 10,000 years in this hellish existence, he had encountered countless heroes, their attempts to vanquish him becoming a monotonous routine.

Mid-battle, the hero's party initiated a high-level Holy magic spell. Aware of its devastating potential against demons and even demon kings, Yuuto chose not to interrupt their incantation. He simply had no care left for this existence. Resigned to his fate, he allowed Yugi's blade to pierce through his body, muttering his final thought of freedom. However, to his surprise, as the heroes released their holy spell bestowed by the gods, Yugi Yuuru, too, showed shock and desperation.

Yet, instead of experiencing the sweet release of death, Yuuto found himself grasped by Yugi's trembling hand, who vowed to follow him wherever he may go. And so, the great Demon Lord breathed his last breath, only to awaken in a strange place. Confused, he inquired about his whereabouts, and a being introduced herself as Rina, the Goddess of Mischievousness and Love.

Rina explained that she had transported Yuuto to another world, a realm where magic and mana were tangible forces, just as they had been in his previous life. Though he had left behind his indestructible body, he could harness mana and magic once more. Moreover, he had the potential to become a Demon Lord in this new world, should he choose to do so. Yet, Yuuto declined, yearning to savor the freedom he had longed for in his previous life.

Pleased with his response, Rina bid him farewell and warned him to be wary of Yugi Yuuru. The shock of the goddess's words resonated within Yuuto as he was abruptly transported to his new reality. To his surprise, he was reborn as Akane Hayakawa, a member of the esteemed Hayakawa family, one of the five renowned noble families.

However, a moment of self-reflection before a mirror revealed the unexpected truth—he was now a girl. Incensed by this revelation, Yuuto cursed Rina, the Goddess of Mischievousness, for her prank. Though life had presented an entirely new set of challenges, Yuuto, now Akane, resolved to navigate this unfamiliar world with determination, determined to enjoy her newfound existence and perhaps find love along the way.

As the story unfolds, Akane Hayakawa embarks on a journey of self-discovery, grappling with her identity, her past, and the evolving dynamics between herself and Yugi Yuuru. In this mysterious realm teeming with magic and possibilities, Akane must navigate a path of her own, one that will shape her destiny and reveal the true extent of her powers.