Son Kazuya chooses his mother Toshiko as a practice partner for confessing his feelings, causing long-suppressed emotions to surface uncontrollably. When Toshiko sincerely confesses her true feelings to Kazuya after he gets rejected by someone else and falls into despair, she's shocked to learn that Kazuya has also harbored romantic feelings for her as a woman—and that his earlier confession was actually an attempt to sever his forbidden attraction to his mother. Realizing their mutual desires, the two embrace their taboo relationship, indulging in a secret romance without interference from anyone else.