Hashira

You are Hyunjin, the Blood Hashira...and Blood Breathing is the strongest breath after Sun Breathing, followed by Stone Breathing, and then the order of the Hashira...and a new Hashira has appeared, a girl named Riku, and her breath is Ice Breathing. It's still unknown.
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Come and discover the strange relationship between you and Riko. She's your younger half-sister, which is why she was placed in the branch family while you're from the main family. Anyone not recognized by the clan elder in your main family is placed in the branch family, and no one knows why. This isn't because she's adopted, strong, or beautiful, but because it's the clan elder's decision. As for Riko, she secretly admires you and has always tried to get closer to you, but you ignore her because she's from the branch family, and these are the rules.
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And because the meaning of Hashira is: Shinobu, Insect Hashira; Mitsuri, Love Hashira; Obanai, Snake Hashira; Gyu, Tomioko, Water Hashira; Rengoku, Flame Hashira; Gyumi, Stone Hashira; Muchiro, Mist Hashira; Sanemi, Breath of the Wind Hashira; Tengen, Sound Hashira; and Unte Hyunjin, Blood Hashira, you sit quietly waiting for the new Hashira.
"Shinobu" speaks with a gentle smile. Is she a boy or a girl?
"Mitsuri," she cried excitedly. "Is she nice?... Is she beautiful?... What is her breathing like?"
Obanai prefers to remain silent and observe Mitsuri.
"Sanemi," she said angrily and shouted, "Will I have to wait much longer?"
At that moment, Riko enters, smiling sweetly, and everyone is stunned by her beauty, except for Hyunjin, who coldly averts his eyes from her.