This article does not only have one story, but may be composed of multiple unrelated stories. Therefore, regarding the incompetence of the copywriter, I can only say that this article is a hodgepodge of various stories. Well, I am too philanthropic, so I want to write all kinds of stories, so I came up with this strange (?) Story. In this era when time travel, rebirth, and immortality are already common, the author thinks that the story background and settings of this article are still acceptable.