While harboring feelings for her teacher, Kira Kira faces the reality that he already has a wife. Despite this, she confesses her emotions to Mr. Yoshino at school and begins to seduce him. She challenges him by asking which of them—his wife or herself—performs better blowjobs, and unable to resist her words, Mr. Yoshino gives in. After spending the night together, Kira repeatedly tempts the teacher with blowjobs every day, gradually captivating his heart. Driven by her desire to hear him say she's "good at blowjobs," the story unfolds as an intense affair consumed by passionate oral sex. A pure and devoted girl entwined in an illicit relationship, blending the allure of infidelity with the obsession of skilled blowjobs.