Tsukuba is highly safe for solo female travelers. Crime rate is extremely low and Japanese people are known globally for their politeness and respectful nature. People are often willing to assist travelers when needed. Public transport is reliable and secure, even during odd hours. Despite the language barrier, most signs have English translations, making navigation relatively easy. Though it's always advisable to exercise basic precautions as a solo traveler, Tsukuba is generally considered a safe and welcoming city for solo female travelers.