Mizuki maintains her composed demeanor as student council president while navigating an unsettling encounter with her teacher, Tanabe. After seeing her sister Aika off to volunteer activities, she receives an unexpected summons and learns of a compromising video involving Aika that threatens her family’s reputation. To secure its destruction, Mizuki reluctantly agrees to Tanabe’s conditions, leading her into unfamiliar territory where her resolve begins to waver. As new sensations take hold, she finds herself caught between resistance and an unexpected surrender to pleasure.