Nepai was once an obscure kata in the Karate world but over the decades it has become common-place. I find the increase in the number of Nepai Karate kata that you can view on the internet baffling but the main reason I think this was is because Nepai was retained by very few Okinawa Karate styles. The only two that I am aware of were Mabuni Kenwa’s Shito-ryu and Kyoda Juhatsu’s Tou’on-ryu. As the story goes both men learned it from Go Kenki during their involvement in the Karate Study Group. Go Kenki, as we all know, was the Chinese tea merchant and supposed crane boxer who immigrated to Okinawa at the turn of the 20th century. Perhaps other students involved with the Karate Study Group may have been familiar with it, but as far as I know they never passed it down.