This makes Japan have the highest age of consent in the developed world along with Turkey and several states in the United States such as California and Florida.
Graph according to Wikipedia There are many criticism inside Japan especially against the obscene act, which the definition is extremely vague.
On the other hand, the rest of the rules are the rules of relationship.
It protects the rights of the parents and its families. It is impossible for anyone in any occasion for anyone under this age to consent in any sexual behavior in Japan.
Age of consent is a confusing topic for foreigners in Japan.
Even professional legal advisers from abroad who do not have previous knowledge on this issue end up failing to give accurate advice to their clients.
As of 2016, only 2 prefectures (Kyoto and Nara) declare relationships between two under 18′s as “not illegal.” Other prefectures promised not to arrest under 18’s in a relationship, but still reserve the capability to prosecute for indecency charges. Also since civil codes define everyone under 20 as a juvenile, having a relationship which involves someone under 20 can also be open to prosecution.
Interference with parental rights (or Abduction of a Minor—penal code 224) is punishable by up to 5 years of forced labor.