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For the bug,  definitely not because the problem is that I cannot interact the door, no "the door is stuck" .Also, specifically you have to go to music room using the bug while being chased by Yuri.

For the secret ending, I know interact to all the door in the map full of chaos ,Haruna will say "there's no door here" ,including the upward stairs. However , same as the bug ,I cannot interact with the downward stair. I think that's the problem. Also, if there's only one possible path ,why the Yuri's room is open?

I really want to see the secret ending.

Thank you.

For the bug, probably you are right but I still remember the time I really can't get the last note in the meeting room to get ending 5. I  directly went to meeting room several time. However I just tried again ,the door to meeting indeed lead to the correct place. Anyways the note doesn't affect the gameplay .I found lots of little bugs in the game play ,this is just one of them. I don't think it's a big deal.

More bug example if you want: hiding in toilet and get stuck.  Also, directly go to the principle's  room ,Yuri comes ,use the bug to music room ,get the key in professors' lounge ,then go back to principle's room and cannot get in.

But for the secret ending, I still don't have any idea. My route is first go to4/F and get the mysterious letter ,then go to Yuri's room and sex scene ,choose yes, then no. After this, the main character will "grab" the key and leave. However I notice that there the key is not in backpack. I followed your instruction ,back to Yuri's room, back to normal school, then go to Angel's room to get the key but when i come back, Yuri is not in her room. I am confused about this part. I later played the game normally but I only get ending 3 in the basement.

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?

Where is the hell is the thirteenth note!? I spent the whole hour finding it.. And the bug that will transport from 4/F to 3/F (when enter the three rooms at4/F )is really annoying.