Oh the cupboard ,I know there must be something in Mia's office.. There's a broken door..
Anyway, the bug is that when I tried to enter the meeting room , I instead show up in the trap room in3/F so as the other three nearby door in 4/F, which should be locked. (Meeting room-->Professor's lounge, door on left-->Music club)The only way is get rid of this situation is S/L.
Also, what should I do in the secret ending ,I picked up the mysterious letter and went to yuri's room .I saw the hell(?) but then what's the next step? I can only enter the yuri's room again and go back to normal. It seems to have a lot of bugs afterward(I can directly go to Angel's room and she will give me the key but when I about to exit Yuri came and the timer starts0500). Should I just follow the normal route/the angel route or there is another way?