As announced on June 16, NMB48 3rd Generation Kenkyuusei Sasaki Nanami will be graduating from the group. The graduation date has not been announced yet.
The reason given is poor physical health, it seems she has problems with her spine that hinder her activities in NMB48.
Sasaki Nanami is the second 3rd Generation member to graduate after Ishikawa Kokoro left in April to focus on her studies.
http://melosnomichi.blogspot.com/2012/06/nmb48-kenkyuusei-sasaki-nanami-to.html

feel sorry for her, but I think it's the best way for her to prioritize her health
