With My Man Kono, now premiering at Pan Asian Repertory, playwright Philip W. Chung has an interesting story to tell. He tells it dutifully, thoroughly, and for the most part clearly. But not excitingly. Chung has done his research. His title character, Toraichi Kono (Brian Lee Huynh), was a Japanese immigrant who made it to the United States in the early 20th century and rose to a position of relative wealth and importance, then saw his fortunes dramatically reverse.