"I swear that I will never love anyone other than you for the rest of my life." All the promises I believed in were lies. I want to build a happy family with the person I love. Reiko, who only hoped for that, was confronted with a cruel reality. After marriage, the husband, who was supposed to be in love, suddenly changed and made a mistress and neglected the family. My husband's stepchild who was worried about such a lonely Reiko. At some point, I fell in love with her as a woman instead of as a mother-in-law.