Yukari is a mother with one child, who also happens to be a teacher at the school her son attends. One day, her son accidentally witnesses Yukari secretly meeting with a colleague. Until then, Yukari had concealed her position from her son, yet accepted that he saw her as a woman. However, once their relationship is discovered, her son undergoes drastic emotional and behavioral changes. As a result, Yukari's life is thrown into turmoil.