it literally took me less than five seconds to google what the age of consent is in Japan and surprise surprise it turns out having sex with 13-year-olds is illegal and morally repugnant there too so I never in my life want to see someone try to use that inhumanly atrocious argument ever again
The national age of consent is 13, but all areas have various laws making it illegal for adults to have sex with teenagers under 17. It is legal for underage people to have sex with each other, because that’s sensible, but not adults having sex with children.