There was really a no tattoos rule??
In Japan, any individual who bears any visible tattoo will be barred from entering or forcibly removed (if they have concealed a tattoo in order to enter the premises) from even a Western-style swimming pool (
i.e. the kind of pool in which one should wear a swimsuit). The revelation that a person bears a tattoo is considered as valid grounds for dismissal of an employee, refusal of service at a commercial establishment,
etc. Bearing a tattoo essentially brands one as a criminal outcast in modern Japanese society.
Note that in ancient times (around the first half of the first millennium AD), Chinese historians wrote about contemporary inhabitants of the Japanese islands as people who were all tattooed, with variations in the marks indicating social distinctions (clan membership, rank,
etc.). The Japanese may have changed their attitude toward tattoos 180 degrees because of their contact with, and consequent attempts to emulate, Chinese culture.