Mizuki, who shows a resolute demeanor as the student council president even towards the sexually harassing teacher, Tanabe. Despite feeling a sense of vulgarity from her beloved sister Aika’s uncharacteristic remarks, Mizuki sees her off to extracurricular service activities. However, when Mizuki is summoned by Tanabe, she is shown lewd footage of her sister, and in exchange for the promise to dispose of the video, she agrees to the man’s demands. As she experiences this for the first time, her consciousness begins to melt away, and she trembles with pleasure…!?
