Jepang Mertua, which translates to "Japanese In-Laws," refers to a common theme in J-Dramas where the relationship between the protagonist's family and their partner's family is a central plot point. This often involves a romantic comedy or drama storyline where the protagonist navigates their relationship with their partner, while also dealing with the challenges of meeting and interacting with their in-laws.
As the wedding plans for Natsumi's mother and Kenji progressed, Natsumi and Taro's relationship blossomed. They discovered that their initial dislike for each other was just a facade, hiding a deep attraction.
This creates the wholesome love story . Instead of conflict, we get collaboration. The mother-in-law helps the girlfriend sneak out for dates, covers for the couple, or gives the wife financial independence. This archetype is popular in modern slice-of-life anime (e.g., Tsuki ga Kirei parent dynamics) where the conflict is external (school, work) and home is a sanctuary.