After divorcing her husband 10 years ago, Suzuhana raised her son alone. He got a job and this spring he will be leaving home... They will leave for a graduation trip together, just the two of them, one last time. Suzuhana doesn't really want to leave, but her son feels the same way. While on the trip, her mother is confused when her son suddenly confesses his love to her... She can't believe that the person her son loved is his mother. The confusion of a mother and the joy of a woman coexist, and the curtain is about to rise on a bittersweet yet sweet story of forbidden eroticism and lust...