User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-3965848-20150524093458/@comment-95.236.190.164-20150525175328

If I'm not wrong, in Japan brother and sister-in-law (that doesn't have the same parents but they married each other in a seconda marriage) can be marry, so technically in Japan, if is not related by blood, is not really considered as incest.