Japanese-American Kevin Yamagata now writes the acclaimed detective comic "Billy Bat" following his service in the Allied Forces during World War II. Yet, as his series achieves massive success, Kevin learns that his famous character, Billy Bat, had already appeared in a Japanese comic. Fearing he might have subconsciously copied something witnessed during his time there, Kevin travels back to Japan to locate Billy Bat's original creator and obtain permission to use their character. However, while tracing the character's origins, he uncovers a dark and twisted history of murders that somehow connect to the figure he believed he had created.