[RJ368943] 悪夢終焉 (The end of the nightmare) Walkthrough help?

[Draconicle]

I tried to make a walkthrough, keep in mind that my english and explaining skills really aren't the best and you will read "floor" and "room" quite often.
If something isn't right or simply isn't working like I wrote it feel free to correct me.
I will split it up into parts, each part is one girl

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for the part 2, after hiding in the right locker, i cant open the middle locker, is it supposed to be locked?