Ten years ago, she divorced her husband and raised her son alone. Now her son has secured a job and will be leaving home this spring. As a final time together, they plan a graduation trip. The mother secretly dreads their separation, unaware her son shares the same feelings. When he suddenly confesses his love during their journey, she is shocked—torn between maternal confusion and feminine joy. A forbidden romance begins to bloom, and a bittersweet, passionate eroticism unfolds between them...