已婚女子優香過著平凡的生活，與丈夫的弟弟正人同住。正人來到東京，志在成為舞台劇演員。由於丈夫回家晚，優香常和正人一起吃晚餐。有一天晚餐時，她聽到正人說：「我接下來的試鏡有一場吻戲，但我沒有經驗，所以很擔心。」優香喝多了，便輕率地提出要陪他練習。然而，兩人嘴唇觸碰的那一刻，一股令人麻木的愧疚感襲上心頭……
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