Statutory Rape Laws in Japan

My question involves criminal law for the state of: Japan
Hello, I am 16 years old girl, and my boyfriend is 31. We love each other and have a healthy relationship, so I didn't really think about the age gap between us. In my country, it is legal to have sexual intercourse from the age of 15, but in Japan it's against the law to have sex with someone under 18 (if the other person is over 20). I want to ask if there is any possibility to make it acceptable by law. For example if my parents are okay with it, or if we show our relationship isn't just about sex/it isn't just one night stand etc.

This site is for United States law only.

You have to ask yourself why a person that is twice your age is in a relationship with you . What could you possible have in common?