Source taken from Wikipedia.org
Samurai X: Trust and Betrayal, released in Japan as Rurouni Kenshin: Tsuiokuhen ( Recollection or Reminiscence?), is a four part original video animation series (OVA) that serves as a prequel to the Rurouni Kenshin anime television series. It was released in Japan in 1999. Set during the Meiji Restoration, it tells the story of how Himura Kenshin becomes the Hitokiri Battōsai, and of his relationship with a woman named Tomoe, who would become his first wife.
In 2003, Trust and Betrayal was collected into a two hour feature-length motion picture with new animated sequences and released in North America as a Director's Cut DVD.