The Café terrace Aya offers delicious coffee and cakes, but not only that, you can actually touch genuine Ko-imari (old Arita porcelain) cups donated by Shibata Yuko of the Mr. and Mrs. Shibata Collection, and drink a coffee or tea with it.
Please relax and refuel after looking around the museum at the Café Terrace Aya.

https://saga-museum.jp/ceramic/facility/cafe.html