Ogawa Rena announced her graduation.
https://ameblo.jp/ko...2308368116.html
edit: Here's the official announcement on H!P's website:
http://www.helloproj...om/news/7553/at
Seems that Kobushi Factory will remain a 6nin group...(unless they add someone else?)
I see no need for them to add anyone else unless they really want to debut some KSS.