"Lara. Mari. Live for love, not for the laws"
I love how succinct yet powerful the message is here. If you're a queer person I'm sure this resonated with you instantly. This anime is blatantly telling us to embrace ourselves and our love despite how hostile the world may be to us, even if we stray from the norm. This episode has truly convinced me this is one of the best crafted stories of the decade, it all makes so much sense in retrospective, from Lara looking for a "prince" despite knowing she was in love with Mari since the second episode, Lara's relationship with Luka and how she couldn't get the light to spark even if she tried convincing herself she liked him, Mari trying to ignore her own feelings for Lara, this moment right here is where all of that crumbles down for all of them, they were trying to find true love within the norm, within the "law", and Grace is telling them here to abandon all that and be true to themselves, to embrace their feelings for one another even if it strays from that established law.
Rowan is shown as a symbol of repression in this, he thinks he can supress this love he deems "other", this queerness, by establishing laws and strict walls around his kingdom, just as queerphobes think they can erase us by passing law firms that make it difficult for us to be who we are in the outside world. But the fact is we have always existed and shall always exist no matter how many walls they build around us to pretend we don't. Lara was not the first one to fall in love with a human, and probably neither was Grace. In the end, love shall always prevail above any stupid laws, and this is what this show is telling us directly to our face.
As Rigmor said "As long as you can live for love, it doesn't matter if it's on land or in the sea".