OMG I THINK I KNOW WHATS GOING TO HAPPEN. SO, MEI IS GOING TO KEEP WEARING THE RING AROUND HER NECK (on the necklace) AND Then one day the Manager will see it and think that it looks familiar, and he's going to remember Yuzu telling him that the ring was for 'her lover', so he'll assume that Mei is Yuzu's lover! And then he's going to ask Mei about it, and Mei will confess and cry etc. AND THEN he'll let her go and cancel their marriage because he wants her to be happy and to be with Yuzu. So Mei will go back to Yuzu and then... I don't know what. But then I had this idea that maybe the Manager ends up inheriting Aihara academy?? Idk highly unlikely but those are my thoughts :)