Shotaro Shiraishi, a writer, anticipated his daughter Risaki's marriage to his editor, Masumi, leading to a shared life together. However, on the wedding day, Risaki vanishes, leaving behind a brief apology. As Shotaro and Masumi grapple with this unexpected turn, their cohabitation sparks intense emotions and desires in this unconventional tale of romance between father-in-law and son-in-law.