Kotori Tsukumo (nee Mizuki)

I had kind of a strange encounter last night after work.

I'd gone to pick up some fabric from the fabric store on my way home and while doing so, I also saw some really nice flowers at a flower shop, so I bought them to place down by the Heartland memorial I made that's located at the base of a tree just outside the SAI building.

But when I arrived, there was already somebody else there.

It was dark, so it was difficult to see them clearly, but they seemed to be wearing mostly all black or dark colours, as well as a mask or something that was obscuring their face.
When I called out to them, they ran off.
I thought maybe they were trying to vandalise the memorial or something, but it was fine when I checked it.

I wonder who that was...