Kusatsu's customary respect for personal space and exceptional level of public safety make it a very safe destination for solo female travelers. The crime rate is low and the locals are generally helpful and respectful. Most areas are well-lit and populated even during the night. It's also easy to navigate, with clear public transportation routes and plenty of signs in English. However, as with any destination, it's always important to maintain normal precautions and be aware of your surroundings.