"Well, two of them are from my world," he said. "The other two are from a world like mine. We all teamed up a long time ago to stop a threat that was facing all our worlds, and that's how I know him."

He thought for a moment. "I wouldn't say close-close, but the one I know from my world I know fairly well. His name is Ichijouji Ken and his partner's name is Wormmon."