NMB48 official blog announce their DRAFT 3rd generation research student Osawa Ai will leave the group at the end of the month, she will hold graduation live at NMB48 Theater on 30 June 2019 (17:00).

Osawa Ai tells the fans that she feels uncomfortable with false rumors about her. She felt shocked those rumor were coming from some fans, she tried to deny them and ignore them, but she was even asked if it is truth or not in handshake event. After discussing with staff, she finds she does not feel settled, and decide to graduate from the group. 

Original source: NMB48 official blog