gay post also its technically 13 but in a similar manner to United states, different prefectures in Japan differing laws. A lot of prefectures have laws called obscenity status, (https://ja.wikipedia.org/wiki/%E6%B7%AB%E8%A1%8C%E6%9D%A1%E4%BE%8B) which can raise the de-facto age of consent unless its a serious romantic relationship. (I think approved by parents of the minor, in a similar manner to marriage with minors in united states) For example in the Tokyo prefecture the age of consent is 18.