Visitor from the World of Anime and Manga

One-line summary: After the barriers between dimensions shatter. (Anime characters in the modern world.) Unscientific wuxia characters. Unscientific myths. Unscientific Greek mythology. Unscientific visitors from the primeval world. When unscientific things start happening all around you. When you live alongside wuxia characters. When you share the same sky with them. And when the dead keep showing up, what are you here to stir up trouble for? This is the story of the director of a paranormal investigations office and his "friends" as they search for his grandfather. But, Grandpa, you told me it would end like this. How ridiculously awful is that! Grandpa smiled faintly and ruffled his hair. "That's just how unscientific things are." Also known as: "An Unscientific World," "The Shattered Boundary," "The Author Is Tired of Caring," "The Characters I Write Won't Behave," and "The Story the Author and the Characters Have to Tell" [Friend's story: Picture Puzzle]