The story begins with Asurika, a talented mage and member of the top adventurer party in the capital, celebrating a successful adventure with her boyfriend Kaito, a swordsman, and Sophia, a healer. Asurika, driven by ambition and a desire for a brighter future, harbors resentment towards Mizer, the party's seemingly useless support member. She views him as a burden and an embarrassment to their growing reputation. During their celebration, Asurika cruelly trips Mizer, relishing his humiliation.
Later, Asurika informs Mizer that he is being expelled from the party. Despite Mizer's quiet pleas and reminders of his contributions, Kaito and Asurika dismiss him, even demanding he leave behind a valuable magic item. Mizer departs, leaving Asurika feeling triumphant and the party's bonds seemingly strengthened. However, this moment of perceived victory is shattered when Asurika is suddenly struck by an intense headache and a chilling premonition of death. Her memories are violently overwritten, and she realizes she is transforming into someone else, becoming a "he" and losing her former self.
She awakens in a room, disoriented, and discovers she has been transmigrated into the body of Asurika, a character from a light novel she had recently read. This Asurika was a mage whose party, after expelling the protagonist Mizer, fell into ruin and ultimately met a tragic end. The protagonist, Mizer, was destined to awaken his true power and rise to success. The narrator, now inhabiting Asurika's body, is initially dismayed by the gender change and the foreknowledge of Asurika's impending death. However, the prospect of a new, fantastical life excites him, despite the drawbacks. He learns of Asurika's past and her tragic fate as depicted in the novel, resolving to avoid it.
He then encounters Mizer, who is traveling alone. The narrator, now in Asurika's body, decides to follow Mizer, intending to manipulate him and ensure his own survival and enjoyment of this new world. He attempts to charm Mizer, but his efforts are met with Mizer's distrust and rejection, stemming from their past interactions.
The journey continues with the narrator, as Asurika, observing Mizer's struggles and his surprising latent abilities. He witnesses Mizer's weakness and lack of magical talent, but also his innate kindness and his ability to inadvertently share his magic. The narrator intervenes to save Mizer from a monster attack, a decision driven by a lingering sense of morality and a desire to keep Mizer alive for his own amusement and plans. He begins to subtly guide Mizer, offering advice and using Asurika's magical skills to protect them, all while maintaining a manipulative facade.
Their travels lead them to a village where the narrator, as Asurika, uses her magic to help the villagers, earning their gratitude and free lodging. He also continues to play mind games with Mizer, alternating between taunts and flirtatious behavior, gradually blurring the lines of their relationship. Mizer, despite his initial distrust, begins to show signs of affection and dependence on Asurika.
The narrative then shifts to Mizer's perspective, revealing his confusion and growing feelings for Asurika, who has become increasingly unpredictable and alluring. He is drawn to her, despite her manipulative actions, and finds himself increasingly reliant on her.
The story progresses through various encounters and challenges, including Mizer's participation in a martial arts tournament where he unexpectedly excels, and the narrator's continued manipulation of Mizer. The narrator also faces a dangerous encounter with a "barbarian" monster, a character from the original novel who was responsible for Asurika's death. He is saved by Mizer, who has awakened his true powers, and their bond deepens.
The narrator's plans to control Mizer are complicated by Mizer's growing affection and his own developing feelings, blurring the lines between manipulation and genuine connection. The story culminates with Mizer declaring his love and proposing a partnership, which the narrator accepts, albeit with his own ulterior motives and a desire for control. The narrative concludes with them embarking on a new journey together, their relationship complex and fraught with unspoken intentions and evolving emotions.