Kotome, a shy and introverted student preparing for college entrance exams, moves to Tokyo to live with her older sister Masami and her brother-in-law. Adjusting to life with her new family, including her brother-in-law Kohei and his father Daikichi, she gradually begins to settle in. Yet, someone is watching her with impure intentions. As Kotome's inner emotions slowly deepen amid her everyday routine, the shifting dynamics and hidden desires surrounding her begin to surface. This story unfolds the complex relationships concealed beneath a quiet domestic life and the troubling feelings Kotome must confront.