i'll hit up a few, i don't know how accurate my take on all of this is. damn these are just a few.
lilies = lesbian love
wall of severance = rules of society such as the family unit, necessity of heterosexual life, societal disapproval of homosexuality, homophobia in general
yuri council = they are the only men in the entire show, they may represent the patriarchy. even in a female world, a world of female relationships, men make the rules
being "invisible" = fitting in and not doing things that make you stand out, such as being a lesbian
the ritual of exclusion = how even school children reject and exclude things that are different, things they struggle to understand. for instance, homosexuality
promise kiss = sexual acceptance and acceptance of identity
the mirror from the story book = it must be destroyed for the girls to have their promise kiss. you must destroy the image of yourself society has built to find the real you. for the girls, they must tear down societies forced heterosexual image and reveal their true selves, their homosexuality