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Kiyosato Akira is a pivotal character in Rurouni Kenshin Saishūshō The Beginning, serving as the tragic catalyst for the film's central conflict. He was the second son of a shōgun retainer and the childhood friend and fiancé of Yukishiro Tomoe. Deeply in love with Tomoe, Kiyosato feared that his modest social standing was insufficient to marry her, leading him to postpone their wedding and leave his home in Edo for Kyoto. There, he joined the Mimawarigumi, a shogunate police force, to improve his prospects and become someone worthy of his betrothed. Within the group, he worked as a bodyguard for the high-ranking samurai Shigekura Jūbei.

Described as a kind and caring man, Kiyosato was not a skilled swordsman or artist; his greatest strengths were his gentle nature and strong work ethic. This kind personality made him well-liked by those around him. His primary motivation was to create a better life for Tomoe and to make her happy, a goal that tragically led him to Kyoto and into the path of the hitokiri. His relationship with Tomoe was the cornerstone of his life, and he also cared for her younger brother, Enishi, treating him like family.

In 1864, Kiyosato's life intersected fatally with that of Himura Kenshin, then known as the ruthless assassin Hitokiri Battōsai. After a night of drinking, Kiyosato and his charges were confronted by Battōsai. In the ensuing fight, despite his lack of extraordinary skill, Kiyosato fought with incredible determination. As he was being cut down, he managed to deliver a deep, lasting wound to Battōsai's left cheek, an act that surprised even the seasoned hitokiri. The film also emphasizes that in his final moments, Kiyosato wept not for himself, but for the future with Tomoe that he was losing, desperately clinging to life and expressing a powerful will to live for the woman he loved. Battōsai, struck by this resolve, would later commend Kiyosato's will and pray for his peace in the next life.

Kiyosato's role in the story is less that of a participant and more of a profound narrative catalyst. His death is the inciting incident for the entire plot of The Beginning. Unbeknownst to Kenshin, the woman he later falls in love with, Tomoe, is Kiyosato's grieving fiancée. Her initial desire for revenge against Kenshin for killing Kiyosato sets the stage for their tragic relationship, as she becomes a spy for Kenshin's enemies while serving alongside him. While Kiyosato does not undergo personal development within the film itself, his death is a critical moment of development for Kenshin. The scar Kiyosato inflicted becomes a permanent mark on Kenshin's face, but more importantly, his desperate plea to live for love plants an early seed of doubt in Kenshin's soul about the value of the life he has taken. This event directly contributes to Kenshin's future turmoil and his eventual vow to never kill again. In terms of abilities, Kiyosato is explicitly noted to have no remarkable martial talent. His only notable feat, born from sheer desperation and willpower rather than skill, was his final act of wounding the legendary Battōsai.