Mayu deeply cherishes her son Yutaka, who has grown up tenderly relying on his mother's affection. Now a salaryman, whenever Yutaka feels anxious, he sleeps beside Mayu and finds comfort in her gentle kisses. One day, Yutaka is set to leave for a business trip overseas, leaving Mayu heartbroken at the thought of their separation. In expressing their emotions, the two share increasingly passionate and intense kisses, resembling lovers. A warm yet bittersweet story of love between mother and son unfolds here.