I first came across Zetsu on FetLife (where else?) several months ago. He is a student of Master K's and contacted me to tell me that both he and K would be visiting Tokyo around the same time. Master K's book, The Beauty of Kinbaku, was going to be published in Japan and K was coming over to sign the contract. For his part, Zetsu is in the planning stages on a book and was coming over to conduct research.
They had quite an adventure, meeting with the likes of Nureki Chimuo, Arisue Go, Naka Akira, Urato Hiroshi and Yukimura Haruki, so it seemed an interview was in order.