Karuizawa is pushed to her breaking point by the girls of Class C. Ayanokoji watches impassively, but Yukimura flies to her aid, unable to bear it. Noticing Karuizawa's abnormal levels of fear, Ayanokoji seems to get an idea...
I expect I can buy the unlock 
method from Ms. Chabashira.
يُفترض أنّ بإمكاني شراء
طريقة فتح القفل من تشاباشيرا-سينسي
Eu suponho que eu possa comprar com a
Chabashira-sensei sobre como destravar.