Am stuck at storyline with Yukiro, it shows blank on her personal information and I counldn't talk to her in school (midday) , but the main story ask me to progress more with her (and I also could not find Effie in gym (morning) )
Try to do everything else for the other characters. A lot of the current story relies on completing most of the little side stories with the girls before your able to advance to the nest part of the main story. If that isnt your problem, my next suggestion would be to do random things. Sorta trial and error it as eventually you will hit the right options to progress