Qibai accidentally traveled to the world of Demon Slayer: Kimetsu no Yaiba, and after being bound to the system, she received an outrageous task - to touch the buttocks of Demon Slayer Tsuji Mukai. Relying on his quick wit, he resolved the fatal disaster and gained innate energy. He became a disciple of Rin Taki Sakonji in Mount Samagiri, and got acquainted with Qio Usagi and Masaki. Determined to break his fate, he used the power of non-breathing methods to counterattack, protect the young man who would eventually die, and make every step of the Demon Slayer's journey.
