>>4480261
In itself there is a difference between a yuri series (romance as the central element) or at least promoted or sold as yuri, to a series that has yuri as an important or prominent element (something like Assault Lily) but not the central element itself or not being so markedly romantic.

That's why at the end of the day it's easier to say that something is yuri than to get picky about what is yuri or not.