The theme of self - discovery also exists. Sometimes, through the process of developing feelings for someone outside of the marriage, the Japanese wife starts to discover new aspects of herself. Maybe she realizes she has different interests or dreams that were suppressed in her marriage. However, this doesn't always lead to an affair but rather can be a catalyst for change within the existing marriage.
Another theme is the conflict between traditional values and personal desires. In Japanese society, there are strong traditional family values. So when a wife is tempted by the idea of an affair due to a newfound love, she has to struggle with what is expected of her in the family and what she really wants in her heart. It's like she's caught between loyalty to her family and the pull of this new relationship.