Just finished two weeks solo in tokyo and honestly felt safer than my home city. Heres the real safety picture:

Jr yamanote line and tokyo metro have women-only train cars during rush hour clearly marked with pink signs and genuinely appreciated by local women commuters.

Walking alone at night felt completely fine in shibuya, harajuku, even golden gai kabukicho red light district. Obviously use normal city precautions but tokyo crime rates are genuinely low even late.

Language barrier bigger issue than safety around tokyo station. Download google translate camera feature. Many people speak some english but not everyone comfortable using it in shinjuku crowds.

Accommodation: business hotels near jr stations felt totally secure. Capsule hotels in asakusa have women-only floors. Airbnb in residential nakameguro areas safe but sometimes awkward with neighbors.

Highly recommend tokyo for solo women travelers. The japanese respect for personal space made navigating crowds stress-free.