Talk:Shop Quest/@comment-3285616-20181111225257/@comment-3285616-20181112001846

I think I solved it. I went to the shop in Sabasa, and now Vanilla says, "I saw Fuma Shurikens in the item shop in Sabasa.  I want to stock them in my shop!"

It's strange, because I even bought shurikens from that shop before and this dialogue didn't occur (It was the "but I'm not stopping there!" dialogue). Not sure if it was because I looked in the shop and left without buying anything this time.

However, this time she says that first line followed by going to the samurai. So I think you have to do something with talking with the item shop owner in Sabasa first.