If the couple moves to a faraway city (Tokyo to Osaka is far enough in Japanese terms), the romance might bloom. If they stay in the koseki (family registry) house, the romance becomes a corpse draped in a silk kimono.
Japanese romantic storylines differ significantly from Western "grand gesture" tropes. They often lean into: Red Thread of Fate: The Japanese Legend of Love! - Sakuraco video sex jepang mertua vs menantu 3gpl
“After an Indonesian chef falls for a Tokyo architect, his traditional mother launches a silent war—using etiquette, illness, and a hidden family register—forcing the couple to build a love strong enough to break three generations of obligation.” If the couple moves to a faraway city