Kasumi Amamiya, 30, chooses a moment of desire over the promise of lifelong happiness. She has secretly longed to be held and loved intensely for six years, and at last the day of her first affair arrives. Married to her childhood friend, she has always shared a bond with him that feels more like close friendship than marriage. They had no sex, yet she kept telling herself she was happy. Trembling with nerves as she steps into her first forbidden encounter, she quickly drowns in its sinful pleasure.