It wouldn’t be a stretch to say that Japan has a comparatively lenient attitude about adults becoming romantically involved with teenagers.
That’s not to say, however, that the Japanese legal system doesn’t try to implement any sort of safeguards against young people being taken advantage of.
● Romantic associations other than a serious relationship will be illegal.
In other words, if you’re a legal adult, Osaka would no longer like you to sleep with underage teenagers…unless you really like each other, that is.
It’s currently unclear what the legal criteria for “serious relationship” would be.