This white unmarked mug is shaped like Kumamoto Castle. It is pagoda like in structure. It has a straw hole in the front.

Kumamoto Castle (熊本城, Kumamoto-jō) is a hilltop Japanese castle located in Chūō-ku, Kumamoto, in Kumamoto Prefecture. It was a large and well fortified castle. The castle keep (天守閣, tenshukaku) is a concrete reconstruction built in 1960, but several ancillary wooden buildings remain of the original castle. Kumamoto Castle is considered one of the three premier castles in Japan, along with Himeji Castle and Matsumoto Castle. Thirteen structures in the castle complex are designated Important Cultural Property.