It is in conexion with this, i guess:
"Stock exchanges nationwide hereby announce that the deadline for transitioning to 100-share trading units has been set as indicated below. The joint decision comes after reviewing responses from 1000-share companies to the “Survey on Transition to 100-share Trading Units”.
Deadline for Transition to 100-share lots: October 1, 2018
http://www.jpx.co.jp/english/news/1020/20160107-01.html