A person over the age of 21 may have sexual intercourse with a person who is 14 years of age or older, but not yet 16 years of age, provided that his or her inability to self-determine sexually is not exploited.
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Yes, you can travel to Japan by yourself. However, if you are 16 years old or younger, then we strongly recommend obtaining a letter of consent from all of your parent(s)/legal guardian(s) and bringing the letter with you to Japan.