Akishito Akato, what are you doing in Japan?

The story is about a boy named Akishito Akato, who came to Japan for a short rest, but due to some circumstances he had to stay here forever…
What are these circumstances? The people who met Akishito are trying to figure them out.
But he can't tell them the truth…
Subsequently, however, someone gets to the truth and finds out the reasons for his actions, and then stranger and more serious events happen, besides, a chase begins for the main character...