That would be the NATIONAL law. (Some of the below MAY have changed with the national 2023/2024 sex-crime law changes, such as making sex with someone who's passed out drunk or someone blackmailed into sex "rape" when it wasn't before, but I kind of doubt it.)
Local corruption of minors and obscenity laws made the effective age of consent higher everywhere except for some island territories. In Tokyo the local law made 18 the effective age of consent. Also it was also corruption of a minor to have an unrelated minor overnight in your home or in a hotel room without consent of the parents or guardian (which, as she is a runaway, they damn sure don't have).