The Anime seems to be an adaptation of the game " Gnosia " ... More nonsense ahead for next year I guess... : https://www.siliconera.com/gnosia-anime-has-been-announced/
Profile of the character on the game's Wiki... : https://gnosia.fandom.com/wiki/Setsu Even Wikipedia has an article on the " non-binary " character " Setsu " : https://en.wikipedia.org/wiki/Setsu
The " non-binary " character sounds like a girl on the Anime trailer... : https://www.youtube.com/watch?v=lDL5xn3cJFQ