The third installment of the drama series that follows in this tradition, focusing on marital taboos, is titled "My Treasure," and its theme is "cuckoldry." "Cuckoldry" refers to the behavior seen in birds like cuckoos, where they lay their eggs in the nests of other birds, leaving them to raise the hatched chicks. Because it's something they can never confess to those around them, it rarely comes to light, but there are women who have children with men other than their husbands and raise them while falsely claiming they are the husband's children. In this production, the protagonist played by Matsumoto is Kanzaki Miwa, a full-time housewife. Miwa, who once worked for a large company but quit her job because she wanted to have children, finds her love for her husband, Kanzaki Hiroki, fading amid their busy lives. Now she even has to endure abuse akin to moral harassment from him. During this difficult time, Miwa unexpectedly reunites with Fuyutsuki Ryo, a childhood friend she had secretly been in love with. They spend a night together, and she ends up becoming pregnant with his child. Miwa then decides to become a villain for the sake of her child, deceiving Hiroki into believing it's his child and making him raise it.—Drama-Otaku

Miwa Kanzaki (Wakana Matsumoto) is married to Hiroki Kanzaki and she is a full-time housewife. She used to work for a large company, but made the difficult decision to quit her job and become a full-time housewife in hopes of having a child. But, Miwa Kanzaki's marriage life isn't going very well. Her love for her husband has cooled considerably. Hiroki Kanzaki acts like an ideal husband when around others, but he speaks harsh words to her when they are alone. She lives her days like a bird in a cage. One day, Miwa Kanzaki meets her childhood friend Ryo Fuyutsuki, whom she hasn't seen in years. Back then, Ryo Fuyutsuki was like a hero to her and loved by her. When she was in trouble, he always came and helped her. They make the fateful decision to spend the night together and Miwa Kanzaki later finds out that she is pregnant with his child. She doesn't want to divorce her husband and become a single mom, because she doesn't have a job. To protect her baby, she decides to tell her husband that she is pregnant with his child.—AsianWiki