Mizuki confronts her teacher with the same unyielding resolve she brings to her student council duties, only to be shown an incriminating video of her younger sister Aika. After sending Aika off to her volunteer activities, Mizuki agrees to the teacher’s terms in exchange for the video’s destruction. What follows is an unfamiliar rush of sensation that gradually overtakes her thoughts, leaving her trembling as her composure gives way to unexpected pleasure.