Oh jeez. Sayaka is just being selfish here. Unless she knows who the dude in the suit is, it has to be some sort of ploy. I can’t imagine Sayaka doing this to “protect” Nina.
ah another problem, Sayaka pressed on a sensitive spot. end of Volume 4.
There is a lot of suspense in terms of relationships, it's hard to know who will end up with whom except for Ayu and Kaji. I will be in the last volume