For some reason, this image gives me massive Nocturne vibes.
I think the background (as simple as it is) is looking like the room we meet Yuko/Aradia . . . I think it's in Yoyogi Park? Been a while, not sure of anything anymore.

Ghost_H said in comment #2643640:

For some reason, this image gives me massive Nocturne vibes.
I think the background (as simple as it is) is looking like the room we meet Yuko/Aradia . . . I think it's in Yoyogi Park? Been a while, not sure of anything anymore.

author confirmed its a nocturne reference.
https://www.youtube.com/watch?v=g-OqL3d1H6Q&t=110s