Kevin Yamagata is a neisei Japanese-American comic book artist; author of the popular detective series 'Billy Bat'. When he learns he may have unconsciously copied the character from an image he saw while serving as a translator in occupied Japan, he returns to Japan to seek permission to use the Billy Bat character from its original creator. Once in Japan, Kevin finds himself embroiled in a string of murders and finds that his Billy Bat comic is somewhat of a prophecy, as events and details he has drawm in his comic start to mirror real life.

Kevin's Japanese name is Kinji Yamagata (山縣金持) and he is said by others to resemble actor Ryo Ikebe. He was born in Orange County, California on November 26, 1923. His parents were both originally from Niigata.

In chapter 93, after finding the ancient scroll, Kevin is confronted by the Yakitori Salesman from earlier in the series, who is working for Kurusu. The Yakitori Salesman demands the scroll from Kevin and threatens to tell people of his involvement in Charlie Ishizuka's death should he not cooperate. Two of Finney's men observe from a distance and, once given the command from Finney himself - who doesn't want the scroll to fall into Kurusu's hands - they seemingly shoot both the Yakitori Salesman and Kevin Yamagata dead.

However, it is revealed later that Kevin Yamagata survives. After recovering from his wounds, he visits the locations enscribed on the scroll and walks the Earth in search of answers to uncover the mystery of Billy Bat.

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