At a quiet inn's outdoor hot spring, married woman Nagisa seeks solace and relaxation. Until half a year ago, she lived an elegant life, deeply connected to her husband. But when she discovered he had a secret child, their marriage quickly fell apart, turning her daily life into chaos. Seeking to fill the emptiness in her heart, Nagisa began pursuing pleasure during her travels, indulging in passionate nights of bliss. That evening, when asked, "What does adultery mean to you, Mrs. Nagisa?", she smiled and replied, "It's my favorite dessert," a response that seemed to carry deeper meaning beneath its sweetness.