@ngkn92 well, legally it is. And by that I mean if they were to have sex (if she's 14, 13 is no go, at least here in Croatia). Not gonna pretend I know Japanese laws and it's 5am at so I'd finally rather go to sleep then look for this Japanese law. Butt it's fine.
As for dating, IIRC there is no law whatsoever for that asnd thus, it's fine.
But for shipping? Nah, not fine.