Aoi has lived happily with her husband since they got married. However, she harbors a secret she can't tell him—her growing, intense feelings of love for her son, Ataru, which surpass those for her husband. These emotions gradually intensify, entangling her heart in an unbearable conflict. A story of deepening emotional turmoil within a family, where the truth hidden deep within her feelings comes to light in a powerful, emotionally charged narrative.