東京の下町、昭和の香りが残る商店街。色とりどりの野菜が並び、威勢の良い声が飛び交うその場所で、彼女だけが異質な光を放っている。秋月夕、47歳、結婚年21目。読者モデルとして誌面を飾る彼女が歩けば、安売りのチラシが舞う路地さえも、一瞬にして華やかなランウェイへと姿を変える。誰もが振り返り、誰もが溜め息をつく「美しき人妻」。しかし、その凛とした横顔の裏側で、彼女の心は常に「ここではないどこか」を彷徨っていた。彼女は今日、夫に内緒で禁断の扉を叩いた…。

In a downtown Tokyo neighborhood, in a shopping street that still retains the atmosphere of the Showa era, amidst the rows of colorful vegetables and the lively voices of vendors, she alone radiates a unique light. Akizuki Yu, 47 years old, married for 21 years. As a reader model, she graces the pages of magazines, and wherever she walks, even the alleyways where sale flyers flutter instantly transform into a glamorous runway. Everyone turns to look, everyone sighs—she is a "beautiful married woman." However, behind that dignified profile, her heart constantly wanders to "somewhere else." Today, she knocked on a forbidden door, without her husband's knowledge…