Mizuki upholds her poised authority as student council president when confronting her teacher Tanabe’s persistent behavior. After noting her sister Aika’s odd remarks and seeing her off to volunteer duties, Mizuki receives an unexpected summons from Tanabe. He reveals compromising footage of Aika and offers to delete it if Mizuki complies with his requests. As the situation intensifies, she begins to lose her usual composure amid a rush of unfamiliar sensations.