双子の子供を授かり、幸せな生活を送る木村夫婦。しかし、熱心な子育ての日々は、夫婦としての営みを許さなかった。子供の成長とともに、ケーキのろうそくが増えていく18年の月日。二人は互いを求めながらも、その想いを胸の奥にしまい込んできた。そして2026年、子供たちが大学合格を機に家を出る。玄関のドアが閉まり、訪れた完全な静寂。見つめ合う二人に、もはや言葉は不要だった。溜まりに溜まった18年分の性欲を、場所を厭わずぶつけ合う…。

The Kimura couple, blessed with twins, were living a happy life. However, their devoted parenting days left no time for intimacy as a couple. Eighteen years passed, with the candles on their cakes increasing as their ******** grew. Though they longed for each other, they kept their feelings hidden deep inside. Then, in 2026, their ******** left home after passing their university entrance exams. The front door closed, and complete silence descended. Words were no longer necessary for the two who gazed at each other. They unleashed 18 years' worth of pent-up sexual desire, regardless of the location…