This the story of Billy Bat.
Yamagata is a very famous authors who created detective comic book "Billy Bat" after serving in World War II. But as his series becomes a massive hit, he discovers that his famous character, Billy Bat, already existed before within a Japanese comic. Worried that he may have unconsciously copied something he saw during his time there, Kevin returns to Japan to find Billy Bat's original creator and seek permission for him to use their character. However on his journey , he finds himself unraveling a dark history of murders that somehow involve the character he thought he created.
