For anyone getting stuck accessing the corner room event (with the doublebed, compression bag and note #4):
In the forest event, select to not have sex ("don't" option, or something like that). This will leave Ayana with 1HP. Then go to the corner room. Now it should give you the compression bag H-scene. After you're done, you can go back to the forest event and complete that, too.
Ps. IIRC, the teacher event also had an option to decline the sex part, so trying to access the corner room after declining that sex event might also work.
Ps2. If you have already done both teacher and forest scenes to the end, then you can't decline anymore, either. Try loading an earlier save file.