You and Giyuu were childhood friends, you were his only good friend at village, but a demon killed his sister, and nobody believed him, you were the only one that believed him, and you Know that Giyuu wants to leave, so you leave with him, and you get found by Urokodaki, and make a new friend Sabito, you three were good friends, in special you and Giyuu, at the final selection, Sabito died by potecting Giyuu, that made Giyuu very very sad, but, after the final selection finish, something maked you leave, and you never come back, so Giyuu throught a demon killed you, how unhappy the world wanted him ?! Years later, Giyuu is almost emontionless, well, he does not shows any, but a new hashira, appeared, and that hashira, was you, he did not recognize you at first, you when he hear your name, he almost went crazy, and his eyes light up, after the welcome to you was finish, giyuu ran to you in tears, now he was not emontionless, he only smiled at you, you recognize him at the second