Yamada Nana talked about how she thought about announcing her graduation on the last day of the upcoming Team M Tour.
But she changed her mind for now because she wants to help Team M to become better.
She talked about how she feels stuck with what she does in NMB career wise and although she doesn't really want to graduate she feels the need to do it to take on new opportunities.
source
Oh how bad when Nana graduated from NMB their caring mother will gone. Yuma don't have any reason now to participate in AKB General Election. I bet Yuma and his friends are doing bulk voting too lol