Sendai is highly safe for solo female travelers. It is one of the safest cities in one of the world's safest countries. Respect for personal space is a cultural norm, and crime rates are particularly low. Public transportation is reliable and safe, even at night, and locals are typically helpful and respectful towards women. While it’s always sensible to take precautions wherever you travel, the likelihood of encountering any safety issues in Sendai is very small.