Recently my neighbor above me, who is married to a Japanese woman, told me that sometimes Japanese men tend to take their wife’s last name under certain circumstances. For example, a little back then, if the wife’s family had no male successor, the husband would take his wife’s surname is he is the younger son or the youngest of his family.
In recent days, it is more for practical reasons, usually business-related. If the wife (’s family) runs a business, the husband would often adopt the wife’s name and therefore being “adopted” into her family or sometimes if she is from a prestigious family.
The funny part is that in the anime, his hair turned white as quickly as Kaneki’s. In the manga, it turned white gradually, especially over the timeskip.
Relatable FE Quote or Something 