Chapters 3-12 of the light novel detail the protagonist, Miyabi, discovering his girlfriend and childhood friend, Aika, cheating on him with another student, Touma, in his own bed. This betrayal leaves Miyabi stunned and questioning their relationship, which he had interpreted as more of a brother-sister bond than a romantic one. He recalls how their relationship began six months prior, initiated by Aika, and how he never truly felt romantic love for her, leading to a recent emotional distance.
Upon arriving at school, Miyabi finds himself the subject of intense scrutiny and contempt. Aika, along with a group of girls, falsely accuses Miyabi of cheating and DV, presenting a fabricated bruise as evidence. Touma, the other student involved, intervenes, presenting himself as Aika's protector and further solidifying the false narrative. Miyabi's attempts to defend himself are dismissed, and he is ostracized by the entire school.
Seeking solace, Miyabi confides in his unconventional science teacher, Yayoi Suou. She reveals that Touma is a problematic student whose wealthy father has significant influence over the school. Despite this, Suou offers her support if Miyabi wishes to clear his name. However, Miyabi, accustomed to being an outcast and finding confrontation troublesome, declines her offer, preferring to endure the situation.
The narrative then introduces Asuka Asumi, a beautiful transfer student with blonde hair and blue eyes, who immediately captivates the school. Asuka, however, takes a peculiar interest in Miyabi, declaring him her "type" and, to his shock, proposing to become his "sex slave." She claims to be attracted to his perceived "scummy" nature, stemming from the false accusations. Miyabi, bewildered and overwhelmed by her extreme personality, rejects her advances, explaining that he was framed.
Asuka, revealed to be a highly intelligent and manipulative individual despite her eccentricities, agrees to help Miyabi clear his name as a condition for him to consider her proposal. She orchestrates a dramatic confrontation in the classroom, presenting evidence of Touma's infidelity and a video confirming that Touma and Aika were the ones who kissed and entered Miyabi's house. Touma's father's financial influence is revealed to be nullified by a recent corruption scandal, leaving him powerless. Aika, confronted with the truth, remains defiant, but Asuka's decisive actions lead to the complete reversal of the situation.
The chapters conclude with Asuka, having successfully cleared Miyabi's name, declaring herself his "slave" and eagerly awaiting his commands. Miyabi, now facing a new set of challenges with Asuka's obsessive devotion, finds his school life irrevocably changed, with the narrative setting the stage for their complex and unusual relationship.
