Demon Slayer: What Happened to Me, Shang Genichi's Sister?

(CP time is revealed, I don't like to enter by mistake.) Tsukuni Seiyu, the adopted daughter of the Kamado family, has not spoken since she regained consciousness. She has forgotten many things, except that she seems to have two older brothers. When she was 12 years old, a lady named Amane visited her and said that the Demon Slayers had the answers she wanted to know. So she left Kamado's family and joined the Demon Slayer Squad. At the age of 14, she took over the role of Seiyu in the country and became a Kotobashi within a month. It was her own breath of Koji, which binds people with words and kills evil with swords. She can actually speak, but every word she speaks comes with a price. In the same year, Jiguo Qingyu met a cold-faced young man who had lost his memory like her. His name is Tokidou Muichiro, and he is very cute. Later, Hashira's meeting unfolded, Tanjiro and Yadouzi appeared in the Demon Slayer Squad, and Seiyu Tsukuni learned about the story of his second brother Enichi and the bad news about the Kamado family. Jiguo Qingyu was very calm. She went to find a fight with him and felt angry in her heart. No matter how much she smiled on her face, she was still very angry. The decisive battle in Infinite City. As the sound of the piano played, Jiguo Qingyu held the sun blade in his hand and finally saw his long-lost brother. The first one on the string is black and dead. "It's really irritating, brother." (Heishimou also gave me a summer job!)