Yū Ren ascended as the previous Shiyuu, leader of the Yuu Tribe's assassin clan, by manipulating fellow ritual participants into targeting Kyou Shou, whom she identified as the strongest rival. Following Kyou Shou's elimination, Yū Ren coldly dispatched the remaining contenders, including her own younger sister. This act of fratricide severed all emotional attachments, granting her the ultimate Shiyuu state. This state bestowed the effects of the Priestess Dance without its performance, negating breath limitations in battle. Her reign commanded absolute authority; subordinates obeyed orders without hesitation, even unto death. Physically, Yū Ren possessed a pale complexion, long straight black hair, and black eyes. Distinctive small red tribal tattoos encircled her mouth and chin, typically hidden beneath a scarf. Her attire reflected traditional Yuu Tribe garments. Her personality embodied ruthlessness and cunning, forged by an assassin's upbringing. She exhibited arrogance, cruelty, and a preference for underhanded tactics, alongside a manipulative streak evident in the conspiracy against Kyou Shou. As Shiyuu, she descended into darker tendencies, displaying sadism and taking pleasure in others' suffering, openly mocking Kyou Kai. Years after the ritual, residing on Mount Rou in Zhao, Yū Ren deliberately leaked her location via rumors, luring Kyou Kai—who sought vengeance for Kyou Shou—into an ambush. She commanded over twenty Yuu Tribe members to attack Kyou Kai while falsely claiming Kyou Kai's sister had betrayed her. When her tribesmen failed, Yū Ren engaged directly, overpowering Kyou Kai with superior skill. However, Kyou Kai entered a profound state of the Hakuryuu technique, moving instinctively to inflict critical wounds before delivering a fatal stab through Yū Ren's heart. Dying, Yū Ren warned the next Shiyuu would hunt Kyou Kai, a warning Kyou Kai defied. Yū Ren's body was concealed to delay the clan's next ritual. Posthumously, Yū Ren appeared in Kyou Kai's vision during a life-sharing technique, positioned between heaven and earth. She taunted Kyou Kai about sacrificing her lifespan and mocked her intent to give everything. Her final prophecy materialized when the subsequent Shiyuu, Kyou Rei, targeted Kyou Kai, though Kyou Rei was ultimately saved from madness by Kyou Kai's intervention. As Shiyuu, Yū Ren was a master assassin of exceptional martial prowess, wielding the named sword Sekikaku. Her stats included a strength rating of 95 + large α, leadership of 80, and intelligence of 83. Her fighting style emphasized evasion and misdirection. Her tactical acumen was demonstrated through her ritual manipulation and absolute tribal control.