Nakamine-sensei may be oblivious, Terajima-sensei may be strict, and Yasuda-sensei may be a hopeless pervert, but they all have one thing in common... They're all teachers at Katagiri High!
someone locked the door 
while we were sleeping.
.أن أحدهم أقفل الباب ونحن نائمين
alguien ha cerrado la puerta
mientras dormíamos.
हम सो रहे थे तब किसी ने
दरवाजा लॉक कर दिया।
a quanto pare ci siamo addormentati 
e qualcuno ci ha chiusi qui dentro...
alguém nos trancou aqui,
enquanto estávamos dormindo...