This city-run museum is famous for its permanent collection of ukiyoe woodblock prints. Extensive gallery spaces spread out over two floors offer a chance to see quite a bit of art in one visit. In addition to the permanent collection there are numerous themed exhibitions, and these tend to focus on Japanese artists from the 18th through 20th centuries.
The museum shop sells an impressive selection of art books as well as framed prints, ukiyoe-themed ceramics and glassware, postcards and various souvenirs. If you're using a Grutto Pass (for free and discounted museum admission), it provides free entrance to the museum's permanent collection only, but as long as you're here it's probably worth paying extra to see the special exhibitions, which tend to be well curated.