Ichika Asada is a 42-year-old mother. One night, she returns home and is shocked to discover her son touching himself. When she questions him, he admits he knows nothing about a woman's body. Moved by his innocence and driven by her own emotions, the mother decides to carefully teach him about sex—for his sake and to express her deepest feelings. The story unfolds with a warm yet bold portrayal of a mother's intimate guidance.