Go upstairs to the first floor on the left side of the hallway there's a door that leads to the staff room. Does the journal not give a hint?
yeah i found it, and if i remember correctly the journal just told me to go to the staff room and the meet miyuki outside, i could have just missed it though. i ended up opening the game files and looking at the background images which kinda helped me figure out which side of the building it was on. i think i just got confused since my brain was telling me that in real life faculty rooms are on the ground floor so i went there first and when i could not find it i was basically running around like a chicken with my head cut off. i did check every floor though before asking i just missed that there was another hallway to the i think left so that is what threw me off i think.