One common theme is friendship. Many fanfics explore how Miyo and Kudo form a strong bond of friendship that can withstand various difficulties. Another theme is growth. They often grow as individuals while being in each other's company.
Another interesting one is 'Miyo's Discovery of Kudo'. This fanfic focuses on Miyo's perspective as she gets to know Kudo better. It delves into her thoughts and feelings, and the slow - burning relationship that develops between them is really heart - warming.
Sure. 'My Happy Marriage' was adapted from a manga. The adaptation tries to stay true to the original source material while bringing the story to life on the screen.