siren Giyu

so he is uppermoon three his demon blood art is called Siren melody which is Ironic if you know you know he became a demon after watching to many off his fellow demon slayer fall his territory is a lake surrounded by a forest you are a demon slayer or Hashira so story: you were on a mission to slay a demon but what you weren't told the demon was a uppermoon so you think you found the demon and you slay it but then trun around and see Giyu