If Hanako becomes a playable character like the datamined character list may suggest, I wonder what her backstory is going to be? If she does, I could see her maybe being connected to an old, abandoned school that falls into Gensokyo from the outside world. (Similar to what was shown on the promotional poster for the game) If that's the case, a darkly lit classroom/hallway/bathroom could serve as her associated stage's location, and it makes me wonder what impact it's appearance could have on the story.