Karen and her husband Hiroshi find their bathroom broken, forcing them to borrow the bath from their neighbors, the Kanda family. Miki, the Kandas' eldest son, has long harbored intense feelings for Karen, and seeing her in a relaxed, vulnerable state after her bath sends his fantasies spiraling out of control. One day, Miki sneaks a peek at Karen while she's bathing—but gets caught staring. To his shock, Karen's response is completely unexpected, shattering all his assumptions and opening the door to something far more intense than he ever imagined.