Final answer:
The story is set in Japan for multiple reasons, including the author's background, the focus on Japanese culture, and the country's rich history.
Step-by-step explanation:
The story is set in Japan for multiple reasons. One reason is that the author is from Japan, as mentioned in option 1, which means they are likely familiar with the culture and can accurately portray it in the story. Additionally, the story is based on Japanese culture, as mentioned in option 2, which means the setting in Japan helps to immerse the readers in the cultural context. Lastly, Japan has a rich history, as mentioned in option 3, and this historical background can add depth and interest to the story.