How does the author develop the plot in the story, UFO in Kushiro?

Komura's wife does not have many active roles in this story, but her passivity is crucial to the story's plot and character development. Komura's wife's only active role appears at the beginning of the story. In this role, she spends most of her time in front of the television, watching news coverage about the earthquake. A couple of days later, she leaves Komura and asks for a divorce. These actions lead to the development of the main plotline in the story, because they cause Komura to travel to Kushiro with the mysterious package.