Dedicated to the sometimes sexually explicit, Pigalle-inspired paintings of Kei Hiraga (1936–2000), this museum is run by the late artist's wife in their old-style villa. Combine admiring the art with a soak in the villa's onsen for an extra fee of ¥500. Cross the Haya-kawa at Yumoto-bashi and take the first right; the museum is down a small lane.