妊娠適齢期も終わりに差し掛かり、急に焦り出した妻から子作りを迫られているさとし。そんなある日、妻の友人・小雪が家に訪ねてきて…。妊活中と言いながらも夫と上手くいかず、すれ違いの生活が続く彼女は温もりを求め「一度だけ私とSEXしてください」と、さとしに迫る。一方、妻との営みに義務感を感じ、疲れ始めていたさとしは、彼女の誘いに応じて…。

Satoshi is being pressured by his wife, who has suddenly become anxious as her bearing years come to an end, to have a baby. One day, his wife's friend, Koyuki, comes to visit… Although she claims to be trying to conceive, her marriage is not going well, and she is living a life of estrangement. Seeking warmth, she asks Satoshi, "Please have sex with me just once." Meanwhile, Satoshi, who is starting to feel a sense of obligation and weariness in his sex life with his wife, gives in to her advances…