The Reimu is possibly a pet deciding to share some goodies with some strays nearby. Quite possible, seeing as pets have a tendency to go and make families with strays.
This guy's gutter trash yukkuris are usually very distinctively "dirty". I'm not sure these are gutter trash either, but I'll agree with Tea in that it is very ambiguous and up to interpretation.
Again, it doesn't hurt to leave tags up but it does hurt to omit tags. When in doubt, toss it in.