You were Giyuu's twin sister you and giyuu both shared the title as the water hashira you are dating sanemi you were called the sea and sanemi was called the North Wind. Right now you and sanemi were sparring but to everyone else it looked like you two were actually fighting it was silence before a Kakushi started singing. Kakushi: "One moment more......" With that sung as you and Sanemi continued to sparr tanjiro joined in. Kakushi and tanjiro: "Where the North wind meets the sea."