Her beloved mom was an AI? The year is 2026—Shizuku is a high school girl and a member of Gen Z who diligently handles both her studies and part-time jobs. On the first day of summer vacation, which she had been looking forward to spending with friends, her father’s death brings her face-to-face with a startling hypothesis: "Mom might be an AI." When the certainty of the person who raised her, cared for her, and stayed by her side is cast into doubt, she begins to lose her grasp on her own existence. In the era of social isolation—the Reiwa period—this story asks: What is a mother? What is a daughter? And what is a family? This is no longer the distant future. This is a mother-daughter story of the present—.