A great warrior, known as a god-slayer, lies undefeated on her deathbed. Her only regret is that she never found a worthy opponent to finally defeat her in battle, as she always dreamed of dying on the battlefield rather than a peaceful sickbed. Her wish is unexpectedly granted when she awakens in the frail body of Nia Liston, a young, sickly daughter of nobles in a future world. Given this second chance at life, the reborn warrior is determined to live for battle once more, using her knowledge of a powerful internal energy called chi to target and eliminate the illness plaguing her new body from within.

The protagonist, Nia Liston, is a small girl whose delicate appearance hides the soul of a battle-hungry hero. Her primary motivation is to find strong opponents and ultimately die in combat, a desire that constantly clashes with her new reality as a noble child. Helping her on her path is her dedicated and somewhat overprotective maid, Rinokis, who often foils Nias more reckless plans in the name of propriety and safety. As she grows, Nia encounters other key figures, including fellow students Hildetaura Altoire and Reliared Silver, who become entangled in her martial ambitions. The story is set in a fantasy world where magic exists, but the reincarnated heroes unique chi techniques are largely unknown, giving her a significant advantage. A notable and unusual aspect of this world is the emergence of magivision, a form of magical broadcasting that Nias family has invested in heavily. To repay her family for the fortune spent trying to cure her, Nia becomes a star on this new medium, leading a double life as a proper idol and a secret warrior.

The narrative follows Nia as she navigates several major arcs. The initial arc focuses on her recovery and her struggle to reconcile her past lifes instincts with her new station. She begins attending the Altoire Academy, where she participates in school martial arts tournaments and forges crucial alliances. Her quest for a worthy challenge leads her to the citys underground arena, where she can fight without restraint. Throughout her journey, the heroic spirit within her drives her to seek ever-stronger foes, turning her into a whirlwind of chaos and combat, all while she maintains the elegant facade expected of a noble lady. This contrast between her cute, refined exterior and her ferocious, merciless interior is the central dynamic of the series.