Note the key condition “by exering influence on the minor virually”. “Exering” is presumably “exerting”. Perhaps you can tell me what “virually” means? “Virtually”? It rather looks like the Child Welfare Law punishes coercion of anyone under 18 into sex. It doesn’t change the age of consent.
Hey, I’m not saying 13 isn’t way too young, just that that is the law in Japan.