Ten years ago, Shihori divorced her husband. Losing custody, she was forced to separate from her son, Hiroaki. However, at Hiroaki's own request, their lives reunited when he enrolled in ●● High School, bringing them under the same roof once again. Driven by her desire to never let Hiroaki go, Shihori grew increasingly intimate with him, gradually building a private world of just the two of them. Over time, an intense bond formed between them—one that went beyond mere affection, inevitably drawing them into a physical relationship.