Japan has strict rules regarding what can be brought into the country, including perfume. Alcohol-based perfumes are allowed if they contain less than 70% alcohol, and oil-based perfumes are allowed as long as they do not contain any prohibited ingredients. Prohibited ingredients include musk and ambergris, which come from animals. Perfume bottles should be sealed and placed in a clear plastic bag, with the total amount of liquid not exceeding 100ml per bottle or 1 liter in total. A customs declaration form must be filled out when entering Japan, and failure to declare items may result in fines or confiscation of the items. If unsure about bringing perfume, it is best to check with customs beforehand or buy it once you arrive in Japan.