Jun Nemoto (45) planned a family trip for her household of three, but her husband was too busy with work, and her son Tsuyoshi was absorbed in his own activities, leaving the travel preparations unfinished. Feeling down about possibly having to travel alone, she found unexpected comfort when Tsuyoshi stepped in to console her. Touched by his kindness, Jun asked Tsuyoshi for a kiss, and their emotions gradually intensified. Crossing the boundaries of their parent-child relationship, their bond evolves into something new, heading toward a moment of forbidden intimacy.