"Rurouni Kenshin: Trust & Betrayal" is a four-episode OVA series that serves as a prequel to the main "Rurouni Kenshin" storyline. It delves into the backstory of Himura Kenshin, a former assassin known as "Hitokiri Battōsai," during the Bakumatsu period in Japan. The narrative explores Kenshin's transformation from a ruthless killer to a man seeking redemption, set against the backdrop of the turbulent Meiji Restoration.

The story begins with Kenshin as a young orphan named Shinta, who is taken in by a master swordsman, Hiko Seijūrō. Renamed Kenshin, he is trained in the Hiten Mitsurugi-ryū style of swordsmanship. As the political climate grows unstable, Kenshin leaves his master to join the Ishin Shishi, a group of revolutionaries fighting to overthrow the Tokugawa shogunate. His exceptional skills earn him the title of Hitokiri Battōsai, a feared assassin who kills without hesitation to achieve the group's goals.

During a mission, Kenshin encounters Yukishiro Tomoe, a woman with a mysterious connection to one of his targets. Tomoe becomes a pivotal figure in Kenshin's life, as her presence challenges his resolve and forces him to confront the moral implications of his actions. Despite their initial antagonism, the two develop a complex relationship, blending love, guilt, and tragedy. Tomoe's past is revealed to be intertwined with Kenshin's role as an assassin, leading to a climactic confrontation that leaves both characters irrevocably changed.

The series also introduces key historical figures and events, such as Katsura Kogorō, a leader of the Ishin Shishi, and the Ikedaya Incident, a real-life attack that plays a significant role in the narrative. These elements ground the story in its historical context while highlighting the personal struggles of its characters.

"Rurouni Kenshin: Trust & Betrayal" is notable for its mature and somber tone, contrasting with the more lighthearted approach of the main series. It examines themes of duty, sacrifice, and the human cost of violence, offering a deeper understanding of Kenshin's motivations and the scars he carries into his later life. The OVA is widely regarded as a standout entry in the "Rurouni Kenshin" franchise, praised for its emotional depth and historical authenticity.