二天一流
In the end of the 1980s, the 10th Soke and the Shihan splintered their ways. At this time, Gosho Motoharu was graded as Iaido Hanshi Hachidan by the ZNIR, and was also responsible for Sekiguchi-ryū. Imai Massayuke did not receive Menkyo Kaiden in Hyōhō Niten Ichi-ryū from Gosho Motoharu, thus breaking the Menkyo Kaiden transmission.