Shiyumi Harima (張間 梓弓) is one of the six Anti-Cloud Gouger Special Forces. Her art is Gansui (岩垂): she lifts and shapes stone. At the bathhouse fight she pulls the ground into the air so the squad can fight Sojo over the ocean instead of a city. Kazane stays beside her as the unused secret weapon. The other four press Sojo. She holds the floor.
What the stone is for
The ACG page on this site used to name her in a line and move on. The fandom wiki and the Vs. Sojo recaps treat Gansui as logistics: civilian streets stay intact because the fight is a set of floating platforms. When Sojo cloaks Mei and comes back for the reserve, he cuts a large section of her head and shoulder. The platforms fall. She is confirmed dead after the battle. Four graves among six. Chihiro is in Kaburato Castle while this happens. Official chapters: VIZ / MANGA Plus.
She is not Hiyuki. Flame Bone is a national pointed end. Gansui is a specialist’s kit for one sword. Recaps that say “the Kamunabi fought Sojo” without the woman holding the islands are skipping the reason the civilians in that stretch live. Unit: Anti-Cloud Gouger. Commander: Hagiwara. The fight: Vs. Sojo.