thereIwasnt said:The Japanese term for Lily is "Yuri". In Japanese flower language it stands for chastity/purity. It's also Japanese slang for girls that are attracted to other girls, as apparently the absence of a guy makes it 'pure'/'chaste', even if what they're doing is neither by Western standards.
Both shows use Lily in the title to highlight themselves as their characters serving both functions.
Only applies to traditional white lilies. Spider Lilies are flower language for death, and you'll see those in the art for other shows like Lycoris Recoil.