Tagajo's Starbucks: Always Sold Out

It's funny to me that Starbucks in Sendai usually are stocked with what they need to make whatever fancy new drink there is, and I've never seen a sold out sign on a big Starbucks promotion within a week of it coming out anywhere but Tagajo. The Starbucks in the library just outside of Tagajo Station, twenty minutes from Sendai on the Senseki line, is always sold out of whatever seasonal thing they are also actively advertising. A similar sold out sign appeared on the sign outside the shop, advertising the new peach frappe, or lack thereof.

I wonder if the people who run this location are just really bad at keeping things stocked. I can't imagine people coming here at such a rate as to cause this issue this often otherwise.