Poor good girl Hinase just when it looked like she had landed the series best gyarus it was torn away from her just as quickly. Also I will applaud the mangaka each student she asked before the gyarus came off as varied and distinct not every mangaka would go that far. I think Yamashiro didn't like the idea of having to share Tsubaki with another girl that Tsubaki had expressed positive feelings for. Though on the other hand I do ship Tsubaki and Piyo so this works to a degree.
Its either yamashiro have an older siblings belong to a film research club before or she was in a club similar to that but something happened and now just have bad memory about it