Hinata Sakaguchi endured an abusive childhood in Japan under a gambling-addicted father whose violence culminated in her pushing him off a cliff to protect her mother—an act that later triggered her mother's mental collapse. A sudden gale transported her to another world at age 15 or 16, where bandits immediately ambushed her. This confrontation unleashed her Unique Skills: "Mathematician" for logical combat analysis and "Usurper" for power theft, enabling her to overwhelm her attackers. Shizue Izawa discovered Hinata and took her as a student. Hinata rapidly surpassed her mentor's abilities within months. Yet deep-seated trauma fostered distrust, driving her to abandon Shizue and wander alone. This solitude hardened her cynicism, cementing her belief that only strength guaranteed survival. Her path changed upon witnessing holy knights defend people from demons, inspiring her to join the Western Holy Church. She rose to Captain of the Holy Knights and one of the Ten Great Saints, becoming the "Right Hand of God" under Luminous—later revealed as the vampire-demon lord Luminous Valentine. Discovering corruption, Hinata confronted and defeated the pope and his demon lord brother. Luminous intervened during the near-fatal conflict, testing Hinata's resolve before appointing her the Holy Empire of Lubelius's most trusted knight. Initially deceived into believing Rimuru Tempest caused Shizue's death, Hinata attacked him twice: first destroying a decoy, then facing him directly. Her defeat in the second battle revealed Rimuru's growth. Betrayed by allies within the Seven Luminaries, she suffered mortal wounds. Luminous revived her, and after resolving misunderstandings with Rimuru, their relationship transformed into mutual respect and alliance. Rimuru's face replaced Shizue's in her memories during recovery, symbolizing her newfound reverence. Hinata mastered supreme swordsmanship, recognized as the western nations' strongest swordswoman. Innate magicule dispersion rendered most magic useless against her. After losing "Usurper," she developed the Ultimate Skill "King of Fortune" granting space-time control, predictive analysis, and enhanced perception. The Sword of Truth amplified her combat energy beyond one million units. Later conflicts involving Granbell Rosso and the Seven Luminaries led Hinata to sacrifice herself to save Chloe Aubert during a temporal crisis. Her soul fragmented across time loops, repeatedly merging with Chloe's across cycles. Rimuru and Luminous restored her body and soul, resurrecting her. This ordeal awakened Chloe as a true Hero and catalyzed Hinata's own evolution into a heroic figure, regaining her "Hero’s Egg" status and mastering her Ultimate Skill. She fought alongside Rimuru as a key ally in the Great War. Personality-wise, Hinata presented as cold, pragmatic, and stubborn, dismissing others' input unless commanded by Luminous. Her leadership blended harsh efficiency with goals aimed at humanity's benefit. Beneath her detached exterior lay kindness toward subordinates and children, masked by rationality. She self-identified as "broken" due to her past, yet her charisma inspired fierce loyalty. She cherished Japanese cuisine, frequently savoring meals prepared by Rimuru.